Open Problem Library
This page describes the OpenProblemLibrary (OPL). The Open Problem Library was previously called the National Problem Library. We have changed the name on most pages but you may still see references to OPL's earlier incarnation as the NPL.
The WeBWorK Open Problem Library (OPL) contains problems contributed by faculty from many institutions that have used WeBWorK. Currently, there are approximately 35,000 problems in the OPL, and new problems are added regularly. The OPL was initially formed from several of the original File Based Problem Libraries, and includes all of the problems from the Arizona State, Rochester, California State-Long Beach, and the University of Virginia 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. Once known as the National Problem Library (NPL), the Open Problem Library (OPL) naming convention was adopted in the summer of 2012 to accommodate the increasing internationalization of WeBWorK and the possible inclusion of problem libraries from textbook publishers.
In addition to merging problem collections from multiple institutions into a single collection, WeBWorK provides a different interface to these problems. Problems in the OPL 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, or section. To a limited extent, problems have been indexed against sections of textbooks, in which case 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.
Faculty from institutions using WeBWorK are invited to submit new problems to the OPL. Submissions are reviewed by members of the OPL OPL Editorial Board which maintains the OPL. The OPL is one of the most popular features of WeBWorK, and its value is based on the many excellent contributions that have been received.
Contents
License
Unless otherwise indicated, copyrights on the content contributed to the WeBWorK Open Problem Library are held by the author(s) of that content. This includes the problem files (*.pg) and any associated auxililary files such as images and custom macro files.
Unless otherwise indicated, all contributions to the WeBWorK Open Problem Library are licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
See license on github site for more details: https://github.com/openwebwork/webwork-open-problem-library/blob/master/OPL_LICENSE
Browsing the OPL
Log into a WeBWorK course and select Library Browser from the links menu. On the resulting screen, click the Open Problem Library button. This allows you to browse the library by a taxonomy of mathematics. For more refined searches, one can restrict to problems which have been marked as going with a particular section of a textbook, or to certain Bloom's taxonomy-type levels.
One can add a stanza in the localOverrides.conf file to obtain an "OPL Directory" button which will enable you to browse the Open Problem Library subdirectories directly.
This lets you see problems based on the institution from which they came.
You can also add a button for the "Contrib" library which contains problems contributed to the OPL but not yet curated and added to the OPL itself. In order to enable the Contrib button you will need to create, from the command line a link to the Contrib directory from templates directory of each course for which the button is to appear.
# In myCourse/templates sudo ln -s /opt/webwork/libraries/webwork-open-problem-library/Contrib Contrib ls -l Contrib Contrib -> /opt/webwork/libraries/webwork-open-problem-library/Contrib
# Additional library buttons can be added to the Library Browser (SetMaker.pm)
# by adding the libraries you want to the following line. For each key=>value
# in the list, if a directory (or link to a directory) with name 'key' appears
# in the templates directory, then a button with name 'value' will be placed at
# the top of the problem browser. (No button will appear if there is no
# directory or link with the given name in the templates directory.) For
# example,
#
# $courseFiles{problibs} = {rochester => "Rochester", asu => "ASU"};
#
# would add two buttons, one for the Rochester library and one for the ASU
# library, provided templates/rochester and templates/asu exists either as
# subdirectories or links to other directories. The "OPL Directory" button
# activated below gives access to all the sub directories in the Open
# Problem Library.
#
$courseFiles{problibs} = {
Library => "OPL Directory",
# rochesterLibrary => "Rochester",
# asuLibrary => "Arizona State",
# dcdsLibrary => "Detroit CDS",
# dartmouthLibrary => "Dartmouth",
# indianaLibrary => "Indiana",
# osuLibrary => "Ohio State",
# capaLibrary => "CAPA",
# ucsbLibrary => "UCSB"
};
Obtaining the OPL
The Open Problem Library can be checked out from the WeBWorK github repository via
cd /opt/webwork/libraries sudo git clone https://github.com/openwebwork/webwork-open-problem-library.git
You may or may not need to use sudo depending on the permissions assigned to the libraries directory.
Insure that the permissions are set so that the webwork server can read the files in the OpenProblemLibrary.
git is a command that is already installed on most unix systems. If not there are standard simple instructions for installing it on your platform available via google search.
Installing the OPL
Assuming the rest of WeBWorK is in /opt/webwork/ proceed as follows to install the OPL. First, make sure you have an /opt/webwork/libraries directory:
mkdir -p /opt/webwork/libraries
The OPL can be downloaded from the OPL github.com repository directly into the library directory. It creates a directory called webwork-open-problem-library
containing the library. The full path to the library will be /opt/webwork/libraries/webwork-open-problem-library/OpenProblemLibrary. This is the library address that should be included in webwork2/conf/localOverrides.conf.
cd /opt/webwork/librariessudo git clone https://github.com/openwebwork/webwork-open-problem-library.git.
For backwards compatibility one can create symbolic links to:
ln -s /opt/webwork/libraries/webwork-open-problem-library/OpenProblemLibrary /opt/webwork/libraries/NationalProblemLibrary
Alternatively one can update the Library link in each course courseName/templates/Library. This requires
more work but is a better solution in the long run. It can be done with a script.
Depending on your previous setup, you may have to create additional symbolic links from the previous locations of libraries to the current ones. In particular, the popular file libraries are now contained in the National Problem Library, so you may need links such as
ln -s /opt/webwork/libraries/webwork-open-problem-library/OpenProblemLibrary/Rochester /opt/webwork/libraries/rochesterLibrary
at least in the short run to keep older set definition files working.
Updating the OPL
The git repository for the OPL 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 OPL periodically, say once per semester.
To update, run the git pull command to download the latest versions from our server. Then, re-run OPL-update.
$ cd /opt/webwork/libraries/webwork-open-problem-library $ git pull $ OPL-update Library version is 2.5; using OPLtables! Mysql database reinitialized. Reading in textbook data from Textbooks in the library /opt/webwork/libraries/OPL. Reading in OPL taxonomy from Taxonomy in the library /opt/webwork/libraries/OPL. Converting data from tagged pgfiles into mysql. Number of files processed: 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 ... $
Contributing to the OPL
If you have written new problems, you might like to contribute them to the NPL so others can benefit from them as well.
See also
Legacy instructions
For WeBWorK 2.6 (or ww2.5.1.1) and later
Modify configuration file and run update
Enter the path to the OpenProblemLibrary into the config file webwork2/conf/localOverrides.conf and set the library version number to 2.5
$problemLibrary{root} ="/opt/webwork/libraries/webwork-open-problem-library/OpenProblemLibrary";
$problemLibrary{version} ="2.5";
Then run webwork2/bin/OPL-update from the command line to update the meta-data for the current collection of problems in the library.
cd /opt/webwork/webwork2/bin/ ./OPL-update
(You will need to have defined WEBWORK_ROOT in your shell environment.)
Configuring your shell in order to run OPL-update from the command line
To make working with WeBWorK easier, there are a couple of changes you can make to your shell environment.
Add the WeBWorK bin directory to your path. This will allow you to run WeBWorK command-line utilities without typing the full path to the utility. If you installed WeBWorK in the default location of /opt/webwork/webwork2, add the directory /opt/webwork/webwork2/bin to your path.
| if your shell is | put this line | in this file |
bash |
export PATH=$PATH:/opt/webwork/webwork2/bin | ~/.bashrc
|
tcsh |
setenv PATH $PATH:/opt/webwork/webwork2/bin | ~/.cshrc
|
Set the WEBWORK_ROOT environment variable. Some command-line scripts rely on this variable to find other WeBWorK files.
| if your shell is | put this line | in this file |
bash |
export WEBWORK_ROOT=/opt/webwork/webwork2 | ~/.bashrc
|
tcsh |
setenv WEBWORK_ROOT /opt/webwork/webwork2 | ~/.cshrc
|
Versions earlier than release 2.6 (or ww2.5.1.1)
Upgrade to release 2.6. Seriously!
Release 2.6 (renamed from ww2.5.1.1) has been in wide spread use for more than a year. You should definitely consider
updating to 2.6. In particular this version contains redesigned configuration files that allow you to upgrade to subsequent
versions such as release 2.7 with few if any modifications to the configuration files. This also allows you to backtrack to earlier
versions if you feel you have upgraded prematurely. Version 2.7 supports essayQuestions among other enhancements. Both version
2.6 and 2.7 support achievements.
If you must use an earlier version of webwork here are the legacy instructions. Good luck. :-)
If you are running WeBWorK 2.3.x, you must create a ProblemLibrary database on your MySQL server. (***** represents the MySQL root password.)
$ mysql -u root Password: ***** > CREATE DATABASE ProblemLibrary; > GRANT SELECT on ProblemLibrary.* TO webworkWrite@localhost; > quit Bye. $
If you are running WeBWorK 2.4.x, this is not necessary since the NPL indexes are stored within the main webwork database.
Configure WeBWorK to access the problem library. The settings are in global.conf:
For WeBWorK 2.3.x:
| variable | description |
$problemLibrary{root} |
Path to NationalProblemLibrary directory. Should be /opt/webwork/libraries/NationalProblemLibrary.
|
$problemLibrary{version} |
Version of the problem library database. Should be =2=. |
$problemLibrary{sourceSQL} |
Name of the database. Should be ProblemLibrary.
|
$problemLibrary{userSQL} |
Username to use when connecting to the database. Can usually be left as $database_username.
|
$problemLibrary{passwordSQL} |
Password to use when connecting to the database. Can usually be left as $database_password.
|
For WeBWorK 2.4.x
| variable | description |
$problemLibrary{root} |
Path to NationalProblemLibrary directory. Should be /opt/webwork/libraries/NationalProblemLibrary.
|
$problemLibrary{version} |
Version of the problem library database. Should be =2=. |
$problemLibrary_db{dbsource} |
Name of the database. Can usually be left as $database_dsn. |
$problemLibrary_db{user} |
Username to use when connecting to the database. Can usually be left as $database_username.
|
$problemLibrary_db{passwd} |
Password to use when connecting to the database. Can usually be left as $database_password.
|
Finally, populate the database:
For WeBWorK 2.3.x:
Run the loadDB2 script to populate the database. This script must be run from the database_problems directory.
$ cd /opt/webwork/libraries/database_problems $ ./loadDB2 What is the root password for mysql? ***** Mysql database reinitialized Converting data from tagged pgfiles into mysql. $
For WeBWorK 2.4.x:
Run the NPL-update script to populate the database. This script is located in the webwork2/bin directory and may be invoked from anywhere.
$ /opt/webwork/webwork2/bin/NPL-update Mysql database reinitialized. Reading in textbook data. Converting data from tagged pgfiles into mysql. Number of files processed: 100 200 300 400 500 600 700 800 900 1000 ... Done. $
There is no need to add symlinks to course templates directory, as is necessary with file based Problem Libraries. It is done automatically.
Updating the NPL
The SVN 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.
To update, run the svn update command to download the latest versions from our server. Then, re-run loadDB2 (WeBWorK 2.3.x) or NPL-update (WeBWorK 2.4.x).
$ cd /opt/webwork/libraries/NationalProblemLibrary $ svn up $ ./NPL-update What is the root password for mysql? ***** (#Or the webworkWrite user, following recent installation instructions) Mysql database reinitialized Converting data from tagged pgfiles into mysql. $
