# Difference between revisions of "Overview of Problem Libraries"

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− | == National Problem Library (NPL) == |
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− | The National Problem Library contains problems from several of the File Based Problem Libraries, including all of the problems from the Arizona State, Rochester, Cal State Long Beach, University of Virginia libraries. It also contains most, if not all, of the problems from Union College, College of New Jersey, Dartmouth, Ohio State, Northern Arizona University, and Indiana University. |
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− | In addition to merging these problem collections into a single collection, WeBWorK provides a different interface to these problems. Problems in the NPL are marked internally with metadata, and instructors can search for problems on the basis of this data. This mechanism is built into WeBWorK's library browser. In particular, one can search hierarchically by course, chapter, section. To a limited extent, problems have been indexed against sections of textbooks in which case an instructor can also search for problems on that basis. WeBWorK stores this information in a database, so part of the installation involves loading metadata into the database. |
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− | === Obtaining the NPL === |
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− | First, make sure you have an <code>/opt/webwork/libraries</code> directory: |
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− | $ mkdir -p /opt/webwork/libraries |
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− | The database problem library can be downloaded from the ASU CVS repository. |
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+ | = Open Problem Library (OPL) = |
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− | $ cd /opt/webwork/libraries |
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+ | The Open Problem Library contains problems from several of the File-Based Problem Libraries, including all of the problems from the Arizona State, Rochester, California State-Long Beach, University of Virginia, and the Utah libraries. It also contains most, if not all, of the problems from Union College, The College of New Jersey, Dartmouth, Ohio State, Northern Arizona University, and Indiana University. |
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− | $ cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/asu co database_problems |
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− | If you are running WeBWorK 2.3.x, you must create a <code>ProblemLibrary</code> database on your MySQL server. (<strong>*****</strong> represents the MySQL root password.) |
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+ | In addition to merging these problem collections into a single collection, WeBWorK provides a different interface to these problems. Problems in the OPL are marked internally with metadata, so instructors can search for problems on the basis of this data. This mechanism is built into WeBWorK's library browser. In particular, one can search hierarchically by course, chapter, or section. To a limited extent, problems have been indexed against textbook sections; therefore, instructors can also search for problems on that basis. WeBWorK stores this information in a database, so part of the installation involves loading metadata into the database. |
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− | $ mysql -u root |
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+ | '''''For more information on downloading, installing, browsing and contributing to the OPL, ''''' |
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− | Password: ***** |
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− | > CREATE DATABASE ProblemLibrary; |
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− | > GRANT SELECT on ProblemLibrary.* TO webworkWrite@localhost; |
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− | > quit |
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− | Bye. |
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− | $ |
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− | If you are running WeBWorK 2.4.x, this is not necessary as the NPL indexes are stored within the main <code>webwork</code> database. |
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+ | ===See: [[Open Problem Library]]=== |
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− | Configure WeBWorK to access the problem library. The settings are in <code>global.conf</code>: |
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+ | = The remainder of this article is out of date = |
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+ | == It is retained for historical purposes only. == |
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− | '''''For WeBWorK 2.3.x:''''' |
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+ | {{Historical }} |
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− | |||

− | {| border="1" |
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− | |- |
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− | | '''variable''' || '''description''' |
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− | |- |
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− | | <code>$problemLibrary{root}</code> || Path to <code>database_problems</code> directory. Should be <code>/opt/webwork/libraries/database_problems</code>. |
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− | |- |
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− | | <code>$problemLibrary{version}</code> || Version of the problem library database. Should be =2=. |
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− | |- |
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− | | <code>$problemLibrary{sourceSQL}</code> || Name of the database. Should be <code>ProblemLibrary</code>. |
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− | |- |
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− | | <code>$problemLibrary{userSQL}</code> || Username to use when connecting to the database. Can usually be left as <code>$database_username</code>. |
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− | |- |
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− | | <code>$problemLibrary{passwordSQL}</code> || Password to use when connecting to the database. Can usually be left as <code>$database_password</code>. |
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− | |} |
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− | |||

− | '''''For WeBWorK 2.4.x''''' |
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− | |||

− | {| border="1" |
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− | |- |
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− | | '''variable''' || '''description''' |
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− | |- |
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− | | <code>$problemLibrary{root}</code> || Path to <code>database_problems</code> directory. Should be <code>/opt/webwork/libraries/database_problems</code>. |
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− | |- |
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− | | <code>$problemLibrary{version}</code> || Version of the problem library database. Should be =2=. |
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− | |- |
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− | | <code>$problemLibrary_db{dbsource}</code> || Name of the database. Can usually be left as $database_dsn. |
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− | |- |
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− | | <code>$problemLibrary_db{user}</code> || Username to use when connecting to the database. Can usually be left as <code>$database_username</code>. |
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− | |- |
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− | | <code>$problemLibrary_db{passwd}</code> || Password to use when connecting to the database. Can usually be left as <code>$database_password</code>. |
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− | |} |
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− | |||

− | Finally, populate the database: |
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− | |||

− | '''''For WeBWorK 2.3.x:''''' |
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− | |||

− | Run the <code>loadDB2</code> script to populate the database. This script must be run from the <code>database_problems</code> directory. |
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− | |||

− | $ cd /opt/webwork/libraries/database_problems |
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− | $ ./loadDB2 |
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− | What is the root password for mysql? ***** |
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− | Mysql database reinitialized |
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− | Converting data from tagged pgfiles into mysql. |
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− | $ |
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− | |||

− | '''''For WeBWorK 2.4.x:''''' |
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− | |||

− | Run the NPL-update script to populate the database. This script is located in the <code>webwork2/bin</code> directory and may be invoked from anywhere. |
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− | |||

− | $ /opt/webwork/webwork2/bin/NPL-update |
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− | Mysql database reinitialized. |
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− | Reading in textbook data. |
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− | Converting data from tagged pgfiles into mysql. |
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− | Number of files processed: |
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− | 100 200 300 400 500 600 700 800 900 1000 |
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− | ... |
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− | Done. |
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− | $ |
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− | |||

− | There is no need to add symlinks to course <code>templates</code> directory, as is necessary with file based Problem Libraries. It is done automatically. |
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− | |||

− | === Browsing the NPL === |
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− | |||

− | Log into a WeBWorK course and select '''Library Browser''' from the links menu. On the resulting screen, click the '''Problem Library''' button. |
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− | |||

− | === Updating the NPL === |
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− | |||

− | The CVS repository for the NPL is updated as problems are added, additional metadata is added, or problem bugs are fixed. So, it is a good idea to update your copy of the NPL periodically, say once per semester. |
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− | |||

− | To update, run the <code>cvs update</code> command to download the latest versions from our server. Then, re-run <code>loadDB2</code> (WeBWorK 2.3.x) or NPL-update (WeBWorK 2.4.x). |
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− | |||

− | $ cd /opt/webwork/libraries/database_problems |
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− | $ cvs -q update -dPA |
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− | $ ./loadDB2 |
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− | What is the root password for mysql? ***** |
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− | Mysql database reinitialized |
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− | Converting data from tagged pgfiles into mysql. |
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− | $ |
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− | |||

− | === Contributing to the NPL === |
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− | |||

− | If you have written new problems, you might like to contribute contribute them to the NPL so others can benefit from them as well. |
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− | |||

− | * [[Tagging Problems]] |
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− | * [[How to Submit Problems to the NPL]] |
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== File Based Problem Libraries == |
== File Based Problem Libraries == |
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These libraries consist of a directory tree organized roughly by the chapters of |
These libraries consist of a directory tree organized roughly by the chapters of |
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a canonical calculus book (or in some cases a canonical text for another subject). |
a canonical calculus book (or in some cases a canonical text for another subject). |
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− | There is no database index of tagged metadata. |
+ | There is no database index of tagged metadata. One should regard the material in these libraries |

+ | as legacy material since we are in the process of adding metadata (tagging the problem), checking the problems |
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+ | for errors and duplicates, and folding them into the OPL. |
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+ | |||

+ | <div style="color:red; font-weight:bold">No new problems should be added to the file-based libraries; they should instead be added to the Open Problem Library (OPL)</div> |
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* The "(CVS)" links for each library allow you to inspect the contents of the library over the web. |
* The "(CVS)" links for each library allow you to inspect the contents of the library over the web. |
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− | * See [[ |
+ | * See [[CVS Access to Problem Libraries]] for instructions on downloading the contents of these libraries via CVS. |

* You can find tarballs of each libraries at http://webhost.math.rochester.edu/webworkdocs/librarytarballs. |
* You can find tarballs of each libraries at http://webhost.math.rochester.edu/webworkdocs/librarytarballs. |
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− | |||

+ | |||

=== Arizona State University Math Problem Library === |
=== Arizona State University Math Problem Library === |
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− | This problem library is now empty. All of the problems have been moved into the |
+ | This problem library is now empty. All of the problems have been moved into the Open Problem Library. |

=== The College of New Jersey Math Problem Library === |
=== The College of New Jersey Math Problem Library === |
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The College of New Jersey (TCNJ) makes a large number of linear algebra |
The College of New Jersey (TCNJ) makes a large number of linear algebra |
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− | problems available in this collection. Please send links of any problems that |
+ | problems available in this collection. Please send links of any problems that do not |

− | work to Tom Hagedorn, <code>hagedorn at tcnj.edu</code>. |
+ | work to Tom Hagedorn, <code>hagedorn at tcnj.edu</code>. |

+ | <div style="color:red; font-weight:bold">This problem library is now a subsection of the Open Problem Library. (OPL). You can search its directories using the "OPL directory" button on the Library Browser </div> |
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+ | |||

+ | ([http://cvs.webwork.rochester.edu/viewcvs.cgi/tcnj_problib/?cvsroot=The+College+of+New+Jersey CVS]) |
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'''''To check out this library:''''' |
'''''To check out this library:''''' |
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calculus book. It also has problems compatible with the later chapters in Stewart's |
calculus book. It also has problems compatible with the later chapters in Stewart's |
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calculus book. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/dartmouth_problib/?cvsroot=Dartmouth+College CVS]) |
calculus book. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/dartmouth_problib/?cvsroot=Dartmouth+College CVS]) |
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+ | |||

+ | <div style="color:red; font-weight:bold">This problem library is now a subsection of the Open Problem Library (OPL). You can search its directories using the "OPL directory" button on the Library Browser </div> |
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'''''To check out this library:''''' |
'''''To check out this library:''''' |
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No description. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/indiana_problib/?cvsroot=Indiana+University CVS]) |
No description. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/indiana_problib/?cvsroot=Indiana+University CVS]) |
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+ | |||

+ | <div style="color:red; font-weight:bold">This problem library is now a subsection of the Open Problem Library (OPL). You can search its directories using the "OPL directory" button on the Library Browser </div> |
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'''''To check out this library:''''' |
'''''To check out this library:''''' |
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The Northern Arizona University Library has new problems for graph theory, statistics and pre-calculus. The <code>setExamples</code> set cleans up some of the problems |
The Northern Arizona University Library has new problems for graph theory, statistics and pre-calculus. The <code>setExamples</code> set cleans up some of the problems |
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− | in Rochester Library's <code>setMAAtutorial</code> set and adds several more. |
+ | in the Rochester Library's <code>setMAAtutorial</code> set and adds several more. |

Send corrections to <code>Nandor.Sieben at nau.edu</code>. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/nau_problib/?cvsroot=Northern+Arizona+University CVS]) |
Send corrections to <code>Nandor.Sieben at nau.edu</code>. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/nau_problib/?cvsroot=Northern+Arizona+University CVS]) |
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=== Union College Math Problem Library === |
=== Union College Math Problem Library === |
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− | The Union College Math Problem Library should now be fully |
+ | The Union College Math Problem Library should now be fully functional. A few of the problems may not work as advertised, since they may have trouble finding the links to auxiliary materials, such as external graphs. |

− | Davide |
+ | Davide Cervone and Kathryn Leash are principally responsible for designing these problems. The level set and 3d problems are particularly nice!! |

− | Please send links of any problems that don't work to <code>gage at math.rochester.edu</code> or <code>dpvc at union.edu</code> or better yet enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/union_problib/?cvsroot=Union+College CVS]) |
+ | Please send links of any problems that don't work to <code>gage at math.rochester.edu</code> or <code>dpvc at union.edu</code> or, better yet, enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/union_problib/?cvsroot=Union+College CVS]) |

'''''To check out this library:''''' |
'''''To check out this library:''''' |
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WeBWorK mathematics homework problems created at the University of |
WeBWorK mathematics homework problems created at the University of |
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− | Georgia. Send corrections to Ted Ashton (ashted at math.uga.edu) or even better |
+ | Georgia. Send corrections to Ted Ashton (ashted at math.uga.edu) or, even better, |

enter them into bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/uga_problib/?cvsroot=University+of+Georgia CVS]) |
enter them into bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/uga_problib/?cvsroot=University+of+Georgia CVS]) |
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=== University of Michigan Math Problem Library === |
=== University of Michigan Math Problem Library === |
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− | This library contains problems related to the Hughes-Hallet et.al. Harvard Calculus text. Send corrections to Gavin |
+ | This library contains problems related to the Hughes-Hallet et.al. Harvard Calculus text. Send corrections to Gavin LaRose, <code>glarose at umich.edu</code>, or even better, enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/umich_problib/?cvsroot=University+of+Michigan CVS]) |

+ | |||

+ | <div style="color:red; font-weight:bold">The bulk of this problem library is now a subsection of the Open Problem Library (OPL). You can search its directories using the "OPL directory" button on the Library Browser </div> |
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+ | |||

+ | Note, however, that in the file-based library, there are also files for the University of Michigan Gateway Tests, which are not currently incorporated into the OPL. |
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'''''To check out this library:''''' |
'''''To check out this library:''''' |
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=== University of Rochester Math Problem Library === |
=== University of Rochester Math Problem Library === |
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− | The Rochester Math Problem Library should now be fully |
+ | The Rochester Math Problem Library should now be fully functional. A few of the problems may not work as advertised, since they may have trouble finding the links to auxiliary materials, such as external graphs. Please send links of any problems that don't work to <code>gage at math.rochester.edu</code> or even better enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/rochester_problib/?cvsroot=UR+Problem+Library CVS]) |

− | The Rochester library includes many problems |
+ | The Rochester library includes many problems prepared by Zbigniew Fiedorowicz at Ohio State University as well as a large number of problems prepared by Jun Wang at Alabama State University |

+ | |||

+ | <div style="color:red; font-weight:bold">This problem library is now a subsection of the Open Problem Library. (OPL). You can search its directories using the "OPL directory" button on the Library Browser </div> |
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'''''To check out this library:''''' |
'''''To check out this library:''''' |
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=== University of Rochester Physics Problem Library === |
=== University of Rochester Physics Problem Library === |
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− | These physics problems were originally written in CAPA and mechanically translated into the PG language. Thanks to help from Frank Wolfs the .eps file pictures now display properly. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/rochester_physics_problib/?cvsroot=UR+Problem+Library CVS]) |
+ | These physics problems were originally written in CAPA and mechanically translated into the PG language. Thanks to help from Frank Wolfs, the .eps file pictures now display properly. ([http://cvs.webwork.rochester.edu/viewcvs.cgi/rochester_physics_problib/?cvsroot=UR+Problem+Library CVS]) |

'''''To check out this library:''''' |
'''''To check out this library:''''' |
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cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/rochester co rochester_grade8problems |
cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/rochester co rochester_grade8problems |
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+ | |||

+ | |||

+ | === Loyola University of Chicago Precalculus problems === |
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+ | |||

+ | '''''To check out this library:''''' |
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+ | |||

+ | cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/loyola_chicago loyola_chicago_problib |
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+ | |||

+ | == See also == |
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+ | |||

+ | * [[What to do if you find a bug in a problem]] |
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+ | |||

+ | [[Category:Problem Libraries]] |

## Latest revision as of 20:20, 23 June 2014

## Contents

- 1 Open Problem Library (OPL)
- 2 The remainder of this article is out of date
- 2.1 It is retained for historical purposes only.
- 2.2 File Based Problem Libraries
- 2.2.1 Arizona State University Math Problem Library
- 2.2.2 The College of New Jersey Math Problem Library
- 2.2.3 Dartmouth College Library
- 2.2.4 Detroit County Day School Math Problem Library (High School)
- 2.2.5 Indiana University Math Problem Library
- 2.2.6 Northern Arizona University Library
- 2.2.7 Union College Math Problem Library
- 2.2.8 UC Santa Barbara and Brooks/Cole
- 2.2.9 University of Georgia Math Problem Library
- 2.2.10 University of Michigan Math Problem Library
- 2.2.11 University of Rochester Math Problem Library
- 2.2.12 University of Rochester Physics Problem Library
- 2.2.13 University of Rochester Grade 8 Math Problems
- 2.2.14 Loyola University of Chicago Precalculus problems

- 2.3 See also

# Open Problem Library (OPL)

The Open Problem Library contains problems from several of the File-Based Problem Libraries, including all of the problems from the Arizona State, Rochester, California State-Long Beach, University of Virginia, and the Utah libraries. It also contains most, if not all, of the problems from Union College, The College of New Jersey, Dartmouth, Ohio State, Northern Arizona University, and Indiana University.

In addition to merging these problem collections into a single collection, WeBWorK provides a different interface to these problems. Problems in the OPL are marked internally with metadata, so instructors can search for problems on the basis of this data. This mechanism is built into WeBWorK's library browser. In particular, one can search hierarchically by course, chapter, or section. To a limited extent, problems have been indexed against textbook sections; therefore, instructors can also search for problems on that basis. WeBWorK stores this information in a database, so part of the installation involves loading metadata into the database.

**For more information on downloading, installing, browsing and contributing to the OPL, **

### See: Open Problem Library

# The remainder of this article is out of date

## It is retained for historical purposes only.

## File Based Problem Libraries

These libraries consist of a directory tree organized roughly by the chapters of a canonical calculus book (or in some cases a canonical text for another subject). There is no database index of tagged metadata. One should regard the material in these libraries as legacy material since we are in the process of adding metadata (tagging the problem), checking the problems for errors and duplicates, and folding them into the OPL.

- The "(CVS)" links for each library allow you to inspect the contents of the library over the web.
- See CVS Access to Problem Libraries for instructions on downloading the contents of these libraries via CVS.
- You can find tarballs of each libraries at http://webhost.math.rochester.edu/webworkdocs/librarytarballs.

### Arizona State University Math Problem Library

This problem library is now empty. All of the problems have been moved into the Open Problem Library.

### The College of New Jersey Math Problem Library

The College of New Jersey (TCNJ) makes a large number of linear algebra
problems available in this collection. Please send links of any problems that do not
work to Tom Hagedorn, `hagedorn at tcnj.edu`

.

(CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/tcnj co tcnj_problib

### Dartmouth College Library

This library has problems compatible with the Marsden and Tromba multi-dimensional calculus book. It also has problems compatible with the later chapters in Stewart's calculus book. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/dartmouth co dartmouth_problib

### Detroit County Day School Math Problem Library (High School)

These high school and pre-calculus level problems were written by Mark Schmidt at Detroit Country Day School. Send corrections to `gage at math.rochester.edu`

or to `M.Schmitt at dcds.edu`

. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/dcds co dcds_problib

### Indiana University Math Problem Library

No description. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/indiana co indiana_problib

### Northern Arizona University Library

The Northern Arizona University Library has new problems for graph theory, statistics and pre-calculus. The `setExamples`

set cleans up some of the problems
in the Rochester Library's `setMAAtutorial`

set and adds several more.
Send corrections to `Nandor.Sieben at nau.edu`

. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/nau co nau_problib

### Union College Math Problem Library

The Union College Math Problem Library should now be fully functional. A few of the problems may not work as advertised, since they may have trouble finding the links to auxiliary materials, such as external graphs.

Davide Cervone and Kathryn Leash are principally responsible for designing these problems. The level set and 3d problems are particularly nice!!

Please send links of any problems that don't work to `gage at math.rochester.edu`

or `dpvc at union.edu`

or, better yet, enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/union co union_problib

### UC Santa Barbara and Brooks/Cole

Problems inspired by Stewart's Calculus book. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/ucsb co ucsb_problib

### University of Georgia Math Problem Library

WeBWorK mathematics homework problems created at the University of Georgia. Send corrections to Ted Ashton (ashted at math.uga.edu) or, even better, enter them into bugzilla via the "report problem bugs" on the PG editor page. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/uga co uga_problib

### University of Michigan Math Problem Library

This library contains problems related to the Hughes-Hallet et.al. Harvard Calculus text. Send corrections to Gavin LaRose, `glarose at umich.edu`

, or even better, enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. (CVS)

Note, however, that in the file-based library, there are also files for the University of Michigan Gateway Tests, which are not currently incorporated into the OPL.

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/umich co umich_problib

### University of Rochester Math Problem Library

The Rochester Math Problem Library should now be fully functional. A few of the problems may not work as advertised, since they may have trouble finding the links to auxiliary materials, such as external graphs. Please send links of any problems that don't work to `gage at math.rochester.edu`

or even better enter them into the WeBWorK bugzilla via the "report problem bugs" on the PG editor page. (CVS)

The Rochester library includes many problems prepared by Zbigniew Fiedorowicz at Ohio State University as well as a large number of problems prepared by Jun Wang at Alabama State University

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/rochester co rochester_problib

### University of Rochester Physics Problem Library

These physics problems were originally written in CAPA and mechanically translated into the PG language. Thanks to help from Frank Wolfs, the .eps file pictures now display properly. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/rochester co rochester_physics_problib

### University of Rochester Grade 8 Math Problems

These problems, written largly by Tori Sweetser, contain material at the level of
the New York State 8th grade exams. Many of these problems are written using the multiple choice and matching tools. Send corrections to `gage at math.rochester.edu`

. (CVS)

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/rochester co rochester_grade8problems

### Loyola University of Chicago Precalculus problems

**To check out this library:**

cvs -d :pserver:anoncvs@cvs.webwork.rochester.edu:/webwork/cvs/loyola_chicago loyola_chicago_problib