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Revision 2694 - (download) (annotate)
Sat Aug 28 01:30:03 2004 UTC (8 years, 8 months ago) by sh002i
File size: 26027 byte(s)
added instructions/examples for problib hash from 2-0-patches

    1 #!perl
    2 ################################################################################
    3 # WeBWorK Online Homework Delivery System
    4 # Copyright © 2000-2003 The WeBWorK Project, http://openwebwork.sf.net/
    5 # $CVSHeader: webwork2/conf/global.conf.dist,v 1.98 2004/08/27 21:13:22 sh002i Exp $
    6 #
    7 # This program is free software; you can redistribute it and/or modify it under
    8 # the terms of either: (a) the GNU General Public License as published by the
    9 # Free Software Foundation; either version 2, or (at your option) any later
   10 # version, or (b) the "Artistic License" which comes with this package.
   11 #
   12 # This program is distributed in the hope that it will be useful, but WITHOUT
   13 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   14 # FOR A PARTICULAR PURPOSE.  See either the GNU General Public License or the
   15 # Artistic License for more details.
   16 ################################################################################
   17 
   18 # This file is used to set up the default WeBWorK course environment for all
   19 # requests. Values may be overwritten by the course.conf for a specific course.
   20 # All package variables set in this file are added to the course environment.
   21 # If you wish to set a variable here but omit it from the course environment,
   22 # use the "my" keyword. The $webwork_dir variable is set in the WeBWorK Apache
   23 # configuration file (webwork.apache-config) and is available for use here. In
   24 # addition, the $courseName variable holds the name of the current course.
   25 
   26 ################################################################################
   27 # Seed variables
   28 ################################################################################
   29 
   30 # Set these variables to correspond to your configuration and preferences. You
   31 # will need to restart the webserver to reset the variables in this section
   32 
   33 # URL of WeBWorK handler.
   34 $webwork_url         = "/webwork2";
   35 
   36 # Root directory of PG.
   37 $pg_dir              = "/opt/pg";
   38 
   39 # URL and path to htdocs directory.
   40 $webwork_htdocs_url  = "/webwork2_files";
   41 $webwork_htdocs_dir  = "$webwork_dir/htdocs";
   42 
   43 # URL and path to courses directory.
   44 $webwork_courses_url = "/webwork2_course_files";
   45 $webwork_courses_dir = "$webwork_dir/courses";
   46 
   47 ################################################################################
   48 # Paths to external programs
   49 ################################################################################
   50 
   51 $externalPrograms{mkdir}    = "/bin/mkdir";
   52 $externalPrograms{mysql}    = "/usr/local/bin/mysql";
   53 
   54 $externalPrograms{latex}    = "/usr/local/bin/latex";
   55 $externalPrograms{pdflatex} = "/usr/local/bin/pdflatex";
   56 $externalPrograms{dvipng}   = "/usr/local/bin/dvipng";
   57 $externalPrograms{tth}      = "/usr/local/bin/tth";
   58 
   59 ################################################################################
   60 # Mail settings
   61 ################################################################################
   62 
   63 # Mail sent by the PG system and the mail merge and feedback modules will be
   64 # sent via this SMTP server.
   65 $mail{smtpServer}            = 'mail.yourschool.edu';
   66 
   67 # When connecting to the above server, WeBWorK will send this address in the
   68 # MAIL FROM command. This has nothing to do with the "From" address on the mail
   69 # message. It can really be anything, but some mail servers require it contain
   70 # a valid mail domain, or at least be well-formed.
   71 $mail{smtpSender}            = 'webwork@yourserver.yourschool.edu';
   72 
   73 # AllowedRecipients defines addresses that the PG system is allowed to send mail
   74 # to. this prevents subtle PG exploits. This should be set in course.conf to the
   75 # addresses of professors of each course. Sending mail from the PG system (i.e.
   76 # questionaires, essay questions) will fail if this is not set somewhere (either
   77 # here or in course.conf).
   78 $mail{allowedRecipients}     = [
   79   #'prof1@yourserver.yourdomain.edu',
   80   #'prof2@yourserver.yourdomain.edu',
   81 ];
   82 
   83 # If defined, feedbackRecipients overrides the list of recipients for feedback
   84 # email. It's appropriate to set this in the course.conf for specific courses,
   85 # but probably not in global.conf. if not defined, mail is sent to all
   86 # professors and TAs for a given course
   87 #$mail{feedbackRecipients}    = [
   88 # 'prof1@yourserver.yourdomain.edu',
   89 # 'prof2@yourserver.yourdomain.edu',
   90 #];
   91 
   92 # feedbackVerbosity:
   93 #  0: send only the feedback comment and context link
   94 #  1: as in 0, plus user, set, problem, and PG data
   95 #  2: as in 1, plus the problem environment (debugging data)
   96 $mail{feedbackVerbosity}     = 1;
   97 
   98 # Defines the size of the Mail Merge editor window
   99 # FIXME: should this be here? it's UI, not mail
  100 # FIXME: replace this with the auto-size method that TWiki uses
  101 $mail{editor_window_rows}    = 15;
  102 $mail{editor_window_columns} = 100;
  103 
  104 ################################################################################
  105 # System-wide locations (directories and URLs)
  106 ################################################################################
  107 
  108 # The root directory, set by webwork_root variable in Apache configuration.
  109 $webworkDirs{root}          = "$webwork_dir";
  110 
  111 # Location of system-wide data files.
  112 $webworkDirs{DATA}          = "$webworkDirs{root}/DATA";
  113 
  114 # Used for temporary storage of uploaded files.
  115 $webworkDirs{uploadCache}   = "$webworkDirs{DATA}/uploads";
  116 
  117 # Location of utility programs.
  118 $webworkDirs{bin}           = "$webworkDirs{root}/bin";
  119 
  120 # Location of configuration files, templates, snippets, etc.
  121 $webworkDirs{conf}          = "$webworkDirs{root}/conf";
  122 
  123 # Location of course directories.
  124 $webworkDirs{courses}       = "$webwork_courses_dir" || "$webworkDirs{root}/courses";
  125 
  126 # Contains log files.
  127 $webworkDirs{logs}          = "$webworkDirs{root}/logs";
  128 
  129 # Contains non-web-accessible temporary files, such as TeX working directories.
  130 $webworkDirs{tmp}           = "$webworkDirs{root}/tmp";
  131 
  132 ##### The following locations are web-accessible.
  133 
  134 # The root URL (usually /webwork2), set by <Location> in Apache configuration.
  135 $webworkURLs{root}          = "$webwork_url";
  136 
  137 # Location of system-wide web-accessible files, such as equation images, and
  138 # help files.
  139 $webworkDirs{htdocs}        = "$webwork_htdocs_dir" || "$webworkDirs{root}/htdocs";
  140 $webworkURLs{htdocs}        = "$webwork_htdocs_url";
  141 
  142 # Location of web-accessible temporary files, such as equation images.
  143 $webworkDirs{htdocs_temp}   = "$webworkDirs{htdocs}/tmp";
  144 $webworkURLs{htdocs_temp}   = "$webworkURLs{htdocs}/tmp";
  145 
  146 # Location of cached equation images.
  147 $webworkDirs{equationCache} = "$webworkDirs{htdocs_temp}/equations";
  148 $webworkURLs{equationCache} = "$webworkURLs{htdocs_temp}/equations";
  149 
  150 # Contains context-sensitive help files.
  151 $webworkDirs{local_help}    = "$webworkDirs{htdocs}/helpFiles";
  152 $webworkURLs{local_help}    = "$webworkURLs{htdocs}/helpFiles";
  153 
  154 # URL of general WeBWorK documentation.
  155 $webworkURLs{docs}          = "http://webhost.math.rochester.edu/webworkdocs/docs";
  156 
  157 # URL of WeBWorK 1.x profLogin.pl script, for access to old professor pages.
  158 # Note that both systems must share a single "courses" directory for this to be
  159 # useful. Leave this blank to disable
  160 $webworkURLs{oldProf}       = "/webwork1/profLogin.pl";
  161 
  162 # URL of WeBWorK Bugzilla database.
  163 $webworkURLs{bugReporter}   = "http://bugs.webwork.rochester.edu/";
  164 
  165 # Location of jsMath script, used for the jsMath display mode.
  166 $webworkURLs{jsMath}        = "$webworkURLs{htdocs}/jsMath/jsMath.js";
  167 
  168 # Location of ASCIIMathML script, used for the asciimath display mode.
  169 $webworkURLs{asciimath}     = "$webworkURLs{htdocs}/ASCIIMathML/ASCIIMathML.js";
  170 
  171 ################################################################################
  172 # Defaults for course-specific locations (directories and URLs)
  173 ################################################################################
  174 
  175 # The root directory of the current course. (The ID of the current course is
  176 # available in $courseName.)
  177 $courseDirs{root}        = "$webworkDirs{courses}/$courseName";
  178 
  179 # Location of course-specific data files, such as WW1 (GDBM) database files.
  180 $courseDirs{DATA}        = "$courseDirs{root}/DATA";
  181 
  182 # Location of authentication data files when using a WW1 (GDBM) database.
  183 $courseDirs{auth_DATA}   = "$courseDirs{DATA}/.auth";
  184 
  185 # Location of course HTML files, passed to PG.
  186 $courseDirs{html}        = "$courseDirs{root}/html";
  187 $courseURLs{html}        = "$webwork_courses_url/$courseName";
  188 
  189 # Location of course image files, passed to PG.
  190 $courseDirs{html_images} = "$courseDirs{html}/images";
  191 
  192 # Location of web-accessible, course-specific temporary files, like static and
  193 # dynamically-generated PG graphics.
  194 $courseDirs{html_temp}   = "$courseDirs{html}/tmp";
  195 $courseURLs{html_temp}   = "$courseURLs{html}/tmp";
  196 
  197 # Location of course-specific logs, like the transaction log.
  198 $courseDirs{logs}        = "$courseDirs{root}/logs";
  199 
  200 # Location of scoring files.
  201 $courseDirs{scoring}     = "$courseDirs{root}/scoring";
  202 
  203 # Location of PG templates and set definition files.
  204 $courseDirs{templates}   = "$courseDirs{root}/templates";
  205 
  206 # Location of course-specific macro files.
  207 $courseDirs{macros}      = "$courseDirs{templates}/macros";
  208 
  209 # Location of mail-merge templates.
  210 $courseDirs{email}       = "$courseDirs{templates}/email";
  211 
  212 ################################################################################
  213 # System-wide files
  214 ################################################################################
  215 
  216 # Location of this file.
  217 $webworkFiles{environment}                      = "$webworkDirs{conf}/global.conf";
  218 
  219 # Flat-file database used to protect against MD5 hash collisions. TeX equations
  220 # are hashed to determine the name of the image file. There is a tiny chance of
  221 # a collision between two TeX strings. This file allows for that. However, this
  222 # is slow, so most people chose not to worry about it. Set this to "" if you
  223 # don't want to use the equation cache file.
  224 $webworkFiles{equationCacheDB}                  = ""; # "$webworkDirs{DATA}/equationcache";
  225 
  226 ##### Hardcopy snippets are used in constructing a TeX file for hardcopy output.
  227 ##### They should contain TeX code unless otherwise noted.
  228 
  229 # The preamble is the first thing in the TeX file.
  230 $webworkFiles{hardcopySnippets}{preamble}       = "$webworkDirs{conf}/snippets/hardcopyPreamble.tex";
  231 
  232 # The setHeader preceeds each set. It is a PG file.
  233 $webworkFiles{hardcopySnippets}{setHeader}      = "$webworkDirs{conf}/snippets/setHeader.pg";  # hardcopySetHeader.pg",
  234 
  235 # The problem divider goes between problems.
  236 $webworkFiles{hardcopySnippets}{problemDivider} = "$webworkDirs{conf}/snippets/hardcopyProblemDivider.tex";
  237 
  238 # The set footer goes after each set. Is is a PG file.
  239 $webworkFiles{hardcopySnippets}{setFooter}      = "$webworkDirs{conf}/snippets/hardcopySetFooter.pg";
  240 
  241 # The set divider goes between sets (in multiset output).
  242 $webworkFiles{hardcopySnippets}{setDivider}     = "$webworkDirs{conf}/snippets/hardcopySetDivider.tex";
  243 
  244 # The user divider does between users (in multiuser output).
  245 $webworkFiles{hardcopySnippets}{userDivider}    = "$webworkDirs{conf}/snippets/hardcopyUserDivider.tex";
  246 
  247 # The postabmle is the last thing in the TeX file.
  248 $webworkFiles{hardcopySnippets}{postamble}      = "$webworkDirs{conf}/snippets/hardcopyPostamble.tex";
  249 
  250 ##### Screen snippets are used when displaying problem sets on the screen.
  251 
  252 # The set header is displayed on the problem set page. It is a PG file.
  253 $webworkFiles{screenSnippets}{setHeader}        = "$webworkDirs{conf}/snippets/setHeader.pg"; # screenSetHeader.pg"
  254 
  255 ################################################################################
  256 # Course-specific files
  257 ################################################################################
  258 
  259 # The course configuration file.
  260 $courseFiles{environment} = "$courseDirs{root}/course.conf";
  261 
  262 # File contents are displayed after login, on the problem sets page. Path given
  263 # here is relative to the templates directory.
  264 $courseFiles{course_info} = "course_info.txt";
  265 
  266 # File contents are displayed on the login page. Path given here is relative to
  267 # the templates directory.
  268 $courseFiles{login_info}  = "login_info.txt";
  269 
  270 # Additional library buttons can be added to the Library Browser (SetMaker.pm)
  271 # by adding the libraries you want to the following line.  For each key=>value
  272 # in the list, if a directory (or link to a directory) with name 'key' appears
  273 # in the templates directory, then a button with name 'value' will be placed at
  274 # the top of the problem browser.  (No button will appear if there is no
  275 # directory or link with the given name in the templates directory.)  For
  276 # example,
  277 #
  278 #     $courseFiles{problibs} = {rochester => "Rochester", asu => "ASU"};
  279 #
  280 # would add two buttons, one for the Rochester library and one for the ASU
  281 # library, provided templates/rochester and templates/asu exists either as
  282 # subdirectories or links to other directories.
  283 #
  284 $courseFiles{problibs}    = {
  285 #   rochesterLibrary => "Rochester",
  286 #   asuLibrary       => "Arizona State",
  287 #   dcdsLibrary      => "Detroit CDS",
  288 #   dartmouthLibrary => "Dartmouth",
  289 #   indianaLibrary   => "Indiana",
  290 #   osuLibrary       => "Ohio State",
  291 };
  292 
  293 ################################################################################
  294 # Database options
  295 ################################################################################
  296 
  297 # Several database are defined in the file conf/database.conf and stored in the
  298 # hash %dbLayouts.
  299 include "conf/database.conf";
  300 
  301 # Select the default database layout. This can be overridden in the course.conf
  302 # file of a particular course. If you choose "gdbm", WeBWorK will be able to
  303 # use courses from WeBWorK 1 without first adding course.conf files to them.
  304 # However, the recommended database layout for new courses is "sql_single". This
  305 # can be set when creating a course.
  306 $dbLayoutName = "sql_single"; # or "gdbm" or "sql"
  307 
  308 # This sets the symbol "dbLayout" as an alias for the selected database layout.
  309 *dbLayout     = $dbLayouts{$dbLayoutName};
  310 
  311 ################################################################################
  312 # Problem library options
  313 ################################################################################
  314 
  315 # The directory containing the problem library files. Set to "" if no problem
  316 # library is installed.
  317 $problemLibrary{root}        = "";
  318 
  319 # The name of the SQL database containing problem metadata
  320 $problemLibrary{sourceSQL}   = "ProblemLibrary";
  321 
  322 # The user name to use when connecting to the problem library database
  323 $problemLibrary{userSQL}     = "webworkRead";
  324 
  325 # The password to use when connecting to the problem library database
  326 $problemLibrary{passwordSQL} = "";
  327 
  328 ################################################################################
  329 # Logs
  330 ################################################################################
  331 
  332 # FIXME: take logs out of %webworkFiles/%courseFiles and give them their own
  333 # top-level hash.
  334 
  335 # Logs data about how long it takes to process problems. (Do not confuse this
  336 # with the /other/ timing log which can be set by WeBWorK::Timing and is used
  337 # for benchmarking system performance in general. At some point, this timing
  338 # mechanism will be deprecated in favor of the WeBWorK::Timing mechanism.)
  339 $webworkFiles{logs}{timing}         = "$webworkDirs{logs}/timing.log";
  340 
  341 # The transaction log contains data from each recorded answer submission. This
  342 # is useful if the database becomes corrupted.
  343 $webworkFiles{logs}{transaction}    = "$courseDirs{logs}/transaction.log";
  344 
  345 # The answer log stores a history of all users' submitted answers.
  346 $courseFiles{logs}{answer_log}      = "$courseDirs{logs}/answer_log";
  347 
  348 ################################################################################
  349 # More paths to external programs
  350 ################################################################################
  351 
  352 # These image conversion utilities are included in the WeBWorK distribution.
  353 $externalPrograms{gif2eps}  = "$webworkDirs{bin}/gif2eps";
  354 $externalPrograms{png2eps}  = "$webworkDirs{bin}/png2eps";
  355 $externalPrograms{gif2png}  = "$webworkDirs{bin}/gif2png";
  356 
  357 ################################################################################
  358 # Site defaults (FIXME: what other things could be "site defaults"?)
  359 ################################################################################
  360 
  361 # Status strings -- lists valid status values and their names. If your site uses
  362 # additional values, add them here.
  363 $siteDefaults{status} = {
  364   A        => "Audit",
  365   audit    => "Audit",
  366   D        => "Drop",
  367   drop     => "Drop",
  368   withdraw => "Drop",
  369   C        => "Enrolled",
  370   current  => "Enrolled",
  371   enrolled => "Enrolled",
  372 };
  373 
  374 ################################################################################
  375 # Frontend options
  376 ################################################################################
  377 
  378 %templates = (
  379   system => "$webworkDirs{conf}/templates/ur.template",
  380 );
  381 
  382 ################################################################################
  383 # Authorization system
  384 ################################################################################
  385 
  386 # This lets you specify a minimum permission level needed to perform certain
  387 # actions.  In the current system, >=10 will allow a professor to perform the
  388 # action, >=5 will allow a TA to, and >=0 will allow a student to perform an
  389 # action (almost never what you want).
  390 
  391 my $student   = 0;
  392 my $ta        = 5;
  393 my $professor = 10;
  394 my $nobody    = undef;
  395 
  396 %permissionLevels = (
  397   report_bugs                    => $student,
  398 
  399   view_multiple_sets             => $ta,
  400   view_unopened_sets             => $ta,
  401   view_unpublished_sets          => $ta,
  402   view_answers                   => $ta,
  403 
  404   become_student                 => $professor,
  405   access_instructor_tools        => $ta,
  406   score_sets                     => $professor,
  407   send_mail                      => $professor,
  408 
  409   create_and_delete_problem_sets => $professor,
  410   assign_problem_sets            => $professor,
  411   modify_problem_sets            => $professor,
  412   modify_student_data            => $professor,
  413 
  414   modify_classlist_files         => $professor,
  415   modify_set_def_files           => $professor,
  416   modify_scoring_files           => $professor,
  417   modify_problem_template_files  => $professor,
  418 
  419   create_and_delete_courses      => $professor,
  420   fix_course_databases           => $professor,
  421 
  422   ##### Behavior of the interactive problem processor #####
  423 
  424   show_correct_answers_before_answer_date         => $ta,
  425   show_solutions_before_answer_date               => $ta,
  426   avoid_recording_answers                         => $ta,
  427 
  428   check_answers_before_open_date                  => $ta,
  429   check_answers_after_open_date_with_attempts     => $ta,
  430   check_answers_after_open_date_without_attempts  => $student,
  431   check_answers_after_due_date                    => $student,
  432   check_answers_after_answer_date                 => $student,
  433 
  434   record_answers_when_acting_as_student           => $nobody,
  435 
  436   # "record_answers_when_acting_as_student" takes precedence
  437   # over the following for professors acting as students:
  438   record_answers_before_open_date                 => $nobody,
  439   record_answers_after_open_date_with_attempts    => $student,
  440   record_answers_after_open_date_without_attempts => $nobody,
  441   record_answers_after_due_date                   => $nobody,
  442   record_answers_after_answer_date                => $nobody,
  443 );
  444 
  445 ################################################################################
  446 # Session options
  447 ################################################################################
  448 
  449 # $sessionKeyTimeout defines seconds of inactivity before a key expires
  450 $sessionKeyTimeout = 60*30;
  451 
  452 # $sessionKeyLength defines the length (in characters) of the session key
  453 $sessionKeyLength = 40;
  454 
  455 # @sessionKeyChars lists the legal session key characters
  456 @sessionKeyChars = ('A'..'Z', 'a'..'z', '0'..'9', '.', '^', '/', '!', '*');
  457 
  458 # Practice users are users who's names start with $practiceUser
  459 # (you can comment this out to remove practice user support)
  460 $practiceUserPrefix = "practice";
  461 
  462 # There is a practice user who can be logged in multiple times.  He's
  463 # commented out by default, though, so you don't hurt yourself.  It is
  464 # kindof a backdoor to the practice user system, since he doesn't have a
  465 # password.  Come to think of it, why do we even have this?!
  466 #$debugPracticeUser = "practice666";
  467 
  468 ################################################################################
  469 # PG subsystem options
  470 ################################################################################
  471 
  472 # List of enabled display modes. Comment out any modes you don't wish to make
  473 # available for use.
  474 $pg{displayModes} = [
  475   "plainText",     # display raw TeX for math expressions
  476   "formattedText", # format math expressions using TtH
  477   "images",        # display math expressions as images generated by dvipng
  478   "jsMath",        # render TeX math expressions on the client side using jsMath
  479   "asciimath",     # render TeX math expressions on the client side using ASCIIMathML
  480 ];
  481 
  482 #### Default settings for the PG translator
  483 
  484 # Default display mode. Should be listed above.
  485 $pg{options}{displayMode}        = "images";
  486 
  487 # The default grader to use, if a problem doesn't specify.
  488 $pg{options}{grader}             = "avg_problem_grader";
  489 
  490 # Fill in answer blanks with the student's last answer by default?
  491 $pg{options}{showOldAnswers}     = 1;
  492 
  493 # Show correct answers (when allowed) by default?
  494 $pg{options}{showCorrectAnswers} = 0;
  495 
  496 # Show hints (when allowed) by default?
  497 $pg{options}{showHints}          = 0;
  498 
  499 # Show solutions (when allowed) by default?
  500 $pg{options}{showSolutions}      = 0;
  501 
  502 # Catch translation warnings internally by default? (We no longer need to do
  503 # this, since there is a global warnings handler. So this should be off.)
  504 $pg{options}{catchWarnings}      = 0;
  505 
  506 ##### Currently-selected renderer
  507 
  508 # Only the local renderer is supported in this version.
  509 $pg{renderer} = "WeBWorK::PG::Local";
  510 
  511 # The remote renderer connects to an XML-RPC PG rendering server.
  512 #$pg{renderer} = "WeBWorK::PG::Remote"'
  513 
  514 ##### Renderer-dependent options
  515 
  516 # The remote renderer has one option:
  517 $pg{renderers}{"WeBWorK::PG::Remote"} = {
  518   # The "proxy" server to connect to for remote rendering.
  519   proxy => "http://localhost:21000/RenderD",
  520 };
  521 
  522 ##### Settings for various display modes
  523 
  524 # "images" mode has several settings:
  525 $pg{displayModeOptions}{images} = {
  526   # Determines the method used to align images in output. Can be
  527   # "baseline", "absmiddle", or "mysql".
  528   dvipng_align => 'baseline',
  529 
  530   # If we choose mysql, we need information on connecting to the
  531   # database. Whatever you use here, you have to create the database
  532   # and grant read/write priveleges to the user listed here. To create
  533   # the database in mysql, as root use:
  534   #
  535   #     CREATE DATABASE DvipngDepths;
  536   #     USE DvipngDepths;
  537   #     CREATE TABLE depths (md5 CHAR(33) NOT NULL, depth SMALLINT, PRIMARY KEY (md5));
  538   #     GRANT ALL ON DvipngDepths.* TO webworkWrite;
  539   #
  540   # In the last statement, "webworkWrite" should match the user below.
  541   dvipng_depth_db => {
  542     dbsource => 'dbi:mysql:DvipngDepths',
  543     user     => $dbLayouts{sql}->{password}->{params}->{usernameRW},
  544     passwd   => $dbLayouts{sql}->{password}->{params}->{passwordRW},
  545   },
  546 };
  547 
  548 ##### Directories used by PG
  549 
  550 # The root of the PG directory tree (from pg_root in Apache config).
  551 $pg{directories}{root}   = "$pg_dir";
  552 $pg{directories}{lib}    = "$pg{directories}{root}/lib";
  553 $pg{directories}{macros} = "$pg{directories}{root}/macros";
  554 
  555 ##### "Special" PG environment variables. (Stuff that doesn't fit in anywhere else.)
  556 
  557 # Users for whom to print the file name of the PG file being processed.
  558 $pg{specialPGEnvironmentVars}{PRINT_FILE_NAMES_FOR} = [ "professor", ];
  559 
  560 # Locations of CAPA resources. (Only necessary if you need to use converted CAPA
  561 # problems.)
  562 $pg{specialPGEnvironmentVars}{CAPA_Tools}             = "$courseDirs{macros}/CAPA_Tools/",
  563 $pg{specialPGEnvironmentVars}{CAPA_MCTools}           = "$courseDirs{macros}/CAPA_MCTools/",
  564 $pg{specialPGEnvironmentVars}{CAPA_GraphicsDirectory} = "$courseDirs{html}/CAPA_Graphics/",
  565 $pg{specialPGEnvironmentVars}{CAPA_Graphics_URL}      = "$courseURLs{html}/CAPA_Graphics/",
  566 
  567 # Size in pixels of dynamically-generated images, i.e. graphs.
  568 $pg{specialPGEnvironmentVars}{onTheFlyImageSize}      = 400,
  569 
  570 ##### PG modules to load
  571 
  572 # The first item of each list is the module to load. The remaining items are
  573 # additional packages to import.
  574 
  575 ${pg}{modules} = [
  576   [qw(DynaLoader)],
  577   [qw(Exporter)],
  578   [qw(GD)],
  579 
  580   [qw(AlgParser AlgParserWithImplicitExpand Expr ExprWithImplicitExpand)],
  581   [qw(AnswerHash AnswerEvaluator)],
  582   [qw(WWPlot)], # required by Circle (and others)
  583   [qw(Circle)],
  584   [qw(Complex)],
  585   [qw(Complex1)],
  586   [qw(Distributions)],
  587   [qw(Fraction)],
  588   [qw(Fun)],
  589   [qw(Hermite)],
  590   [qw(Label)],
  591   [qw(List)],
  592   [qw(Match)],
  593   [qw(MatrixReal1)], # required by Matrix
  594   [qw(Matrix)],
  595   [qw(Multiple)],
  596   [qw(PGrandom)],
  597   [qw(Regression)],
  598   [qw(Select)],
  599   [qw(Units)],
  600   [qw(VectorField)],
  601   [qw(Parser Value)],
  602 ];
  603 
  604 ##### Answer evaluatior defaults
  605 
  606 $pg{ansEvalDefaults} = {
  607   functAbsTolDefault            => .001,
  608   functLLimitDefault            => .0000001,
  609   functMaxConstantOfIntegration => 1E8,
  610   functNumOfPoints              => 3,
  611   functRelPercentTolDefault     => .1,
  612   functULimitDefault            => .9999999,
  613   functVarDefault               => "x",
  614   functZeroLevelDefault         => 1E-14,
  615   functZeroLevelTolDefault      => 1E-12,
  616   numAbsTolDefault              => .001,
  617   numFormatDefault              => "",
  618   numRelPercentTolDefault       => .1,
  619   numZeroLevelDefault           => 1E-14,
  620   numZeroLevelTolDefault        => 1E-12,
  621   useBaseTenLog                 => 0,
  622   defaultDisplayMatrixStyle     => "[s]",
  623 };
  624 
  625 ################################################################################
  626 # Compatibility
  627 ################################################################################
  628 
  629 # Define the old names for the various "root" variables.
  630 $webworkRoot    = $webworkDirs{root};
  631 $webworkURLRoot = $webworkURLs{root};
  632 $pgRoot         = $pg{directories}{root};

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