View of /trunk/webwork2/conf/global.conf.dist

    1 #!perl
    2 ################################################################################
    3 # WeBWorK Online Homework Delivery System
    4 # Copyright © 2000-2003 The WeBWorK Project, http://openwebwork.sf.net/
    5 # $CVSHeader: webwork-modperl/conf/global.conf.dist,v 1.93 2004/07/16 00:59:14 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.
   31 # You will need to restart the webserver to reset the variables in this section
   32 #
   33 
   34 # URL of WeBWorK handler.
   35 $webwork_url         = "/webwork2";
   36 
   37 # Root directory of PG.
   38 $pg_dir              = "/opt/pg";
   39 
   40 # URL and path to htdocs directory.
   41 $webwork_htdocs_url  = "/webwork2_files";
   42 $webwork_htdocs_dir  = "$webwork_dir/htdocs";
   43 
   44 # URL and path to courses directory.
   45 $webwork_courses_url = "/webwork2_course_files";
   46 $webwork_courses_dir = "$webwork_dir/courses";
   47 
   48 ################################################################################
   49 # Paths to external programs
   50 ################################################################################
   51 
   52 $externalPrograms{mkdir}    = "/bin/mkdir";
   53 $externalPrograms{mysql}    = "/usr/local/bin/mysql";
   54 
   55 $externalPrograms{latex}    = "/usr/local/bin/latex";
   56 $externalPrograms{pdflatex} = "/usr/local/bin/pdflatex";
   57 $externalPrograms{dvipng}   = "/usr/local/bin/dvipng";
   58 $externalPrograms{tth}      = "/usr/local/bin/tth";
   59 
   60 ################################################################################
   61 # Mail settings
   62 ################################################################################
   63 
   64 # Mail sent by the PG system and the mail merge and feedback modules will be
   65 # sent via this SMTP server.
   66 $mail{smtpServer}            = 'mail.yourschool.edu';
   67 
   68 # When connecting to the above server, WeBWorK will send this address in the
   69 # MAIL FROM command. This has nothing to do with the "From" address on the mail
   70 # message. It can really be anything, but some mail servers require it contain
   71 # a valid mail domain, or at least be well-formed.
   72 $mail{smtpSender}            = 'webwork@yourserver.yourschool.edu';
   73 
   74 # AllowedRecipients defines addresses that the PG system is allowed to send mail
   75 # to. this prevents subtle PG exploits. This should be set in course.conf to the
   76 # addresses of professors of each course. Sending mail from the PG system (i.e.
   77 # questionaires, essay questions) will fail if this is not set somewhere (either
   78 # here or in course.conf).
   79 $mail{allowedRecipients}     = [
   80   #'prof1@yourserver.yourdomain.edu',
   81   #'prof2@yourserver.yourdomain.edu',
   82 ];
   83 
   84 # If defined, feedbackRecipients overrides the list of recipients for feedback
   85 # email. It's appropriate to set this in the course.conf for specific courses,
   86 # but probably not in global.conf. if not defined, mail is sent to all
   87 # professors and TAs for a given course
   88 $mail{feedbackRecipients}    = [
   89   #'prof1@yourserver.yourdomain.edu',
   90   #'prof2@yourserver.yourdomain.edu',
   91 ];
   92 
   93 # feedbackVerbosity:
   94 #  0: send only the feedback comment and context link
   95 #  1: as in 0, plus user, set, problem, and PG data
   96 #  2: as in 1, plus the problem environment (debugging data)
   97 $mail{feedbackVerbosity}     = 1;
   98 
   99 # Defines the size of the Mail Merge editor window
  100 # FIXME: should this be here? it's UI, not mail
  101 # FIXME: replace this with the auto-size method that TWiki uses
  102 $mail{editor_window_rows}    = 15;
  103 $mail{editor_window_columns} = 100;
  104 
  105 ################################################################################
  106 # System-wide locations (directories and URLs)
  107 ################################################################################
  108 
  109 # The root directory, set by webwork_root variable in Apache configuration.
  110 $webworkDirs{root}          = "$webwork_dir";
  111 
  112 # Location of system-wide data files.
  113 $webworkDirs{DATA}          = "$webworkDirs{root}/DATA";
  114 
  115 # Used for temporary storage of uploaded files.
  116 $webworkDirs{uploadCache}   = "$webworkDirs{DATA}/uploads";
  117 
  118 # Location of utility programs.
  119 $webworkDirs{bin}           = "$webworkDirs{root}/bin";
  120 
  121 # Location of configuration files, templates, snippets, etc.
  122 $webworkDirs{conf}          = "$webworkDirs{root}/conf";
  123 
  124 # Location of course directories.
  125 $webworkDirs{courses}       = "$webwork_courses_dir" || "$webworkDirs{root}/courses";
  126 
  127 # Contains log files.
  128 $webworkDirs{logs}          = "$webworkDirs{root}/logs";
  129 
  130 # Contains non-web-accessible temporary files, such as TeX working directories.
  131 $webworkDirs{tmp}           = "$webworkDirs{root}/tmp";
  132 
  133 ##### The following locations are web-accessible.
  134 
  135 # The root URL (usually /webwork2), set by <Location> in Apache configuration.
  136 $webworkURLs{root}          = "$webwork_url";
  137 
  138 # Location of system-wide web-accessible files, such as equation images, and
  139 # help files.
  140 $webworkDirs{htdocs}        = "$webwork_htdocs_dir" || "$webworkDirs{root}/htdocs";
  141 $webworkURLs{htdocs}        = "$webwork_htdocs_url";
  142 
  143 # Location of web-accessible temporary files, such as equation images.
  144 $webworkDirs{htdocs_temp}   = "$webworkDirs{htdocs}/tmp";
  145 $webworkURLs{htdocs_temp}   = "$webworkURLs{htdocs}/tmp";
  146 
  147 # Location of cached equation images.
  148 $webworkDirs{equationCache} = "$webworkDirs{htdocs_temp}/equations";
  149 $webworkURLs{equationCache} = "$webworkURLs{htdocs_temp}/equations";
  150 
  151 # Contains context-sensitive help files.
  152 $webworkDirs{local_help}    = "$webworkDirs{htdocs}/helpFiles";
  153 $webworkURLs{local_help}    = "$webworkURLs{htdocs}/helpFiles";
  154 
  155 # URL of general WeBWorK documentation.
  156 $webworkURLs{docs}          = "http://webhost.math.rochester.edu/webworkdocs/docs";
  157 
  158 # URL of WeBWorK 1.x profLogin.pl script, for access to old professor pages.
  159 # Note that both systems must share a single "courses" directory for this to be
  160 # useful. Leave this blank to disable
  161 $webworkURLs{oldProf}       = "/webwork1/profLogin.pl";
  162 
  163 # URL of WeBWorK Bugzilla database.
  164 $webworkURLs{bugReporter}   = "http://bugs.webwork.rochester.edu/enter_bug.cgi?product=WeBWorK%20mod_perl";
  165 
  166 # Location of jsMath script, used for the jsMath display mode.
  167 $webworkURLs{jsMath}        = "$webworkURLs{htdocs}/jsMath/jsMath.js";
  168 
  169 # Location of ASCIIMathML script, used for the asciimath display mode.
  170 $webworkURLs{asciimath}     = "$webworkURLs{htdocs}/ASCIIMathML/ASCIIMathML.js";
  171 
  172 ################################################################################
  173 # Defaults for course-specific locations (directories and URLs)
  174 ################################################################################
  175 
  176 # The root directory of the current course. (The ID of the current course is
  177 # available in $courseName.)
  178 $courseDirs{root}        = "$webworkDirs{courses}/$courseName";
  179 
  180 # Location of course-specific data files, such as WW1 (GDBM) database files.
  181 $courseDirs{DATA}        = "$courseDirs{root}/DATA";
  182 
  183 # Location of authentication data files when using a WW1 (GDBM) database.
  184 $courseDirs{auth_DATA}   = "$courseDirs{DATA}/.auth";
  185 
  186 # Location of course HTML files, passed to PG.
  187 $courseDirs{html}        = "$courseDirs{root}/html";
  188 $courseURLs{html}        = "$webwork_courses_url/$courseName";
  189 
  190 # Location of course image files, passed to PG.
  191 $courseDirs{html_images} = "$courseDirs{html}/images";
  192 
  193 # Location of web-accessible, course-specific temporary files, like static and
  194 # dynamically-generated PG graphics.
  195 $courseDirs{html_temp}   = "$courseDirs{html}/tmp";
  196 $courseURLs{html_temp}   = "$courseURLs{html}/tmp";
  197 
  198 # Location of course-specific logs, like the transaction log.
  199 $courseDirs{logs}        = "$courseDirs{root}/logs";
  200 
  201 # Location of scoring files.
  202 $courseDirs{scoring}     = "$courseDirs{root}/scoring";
  203 
  204 # Location of PG templates and set definition files.
  205 $courseDirs{templates}   = "$courseDirs{root}/templates";
  206 
  207 # Location of course-specific macro files.
  208 $courseDirs{macros}      = "$courseDirs{templates}/macros";
  209 
  210 # Location of mail-merge templates.
  211 $courseDirs{email}       = "$courseDirs{templates}/email";
  212 
  213 ################################################################################
  214 # System-wide files
  215 ################################################################################
  216 
  217 # Location of this file.
  218 $webworkFiles{environment}                      = "$webworkDirs{conf}/global.conf";
  219 
  220 # Flat-file database used to protect against MD5 hash collisions. TeX equations
  221 # are hashed to determine the name of the image file. There is a tiny chance of
  222 # a collision between two TeX strings. This file allows for that. However, this
  223 # is slow, so most people chose not to worry about it. Set this to "" if you
  224 # don't want to use the equation cache file.
  225 $webworkFiles{equationCacheDB}                  = ""; # "$webworkDirs{DATA}/equationcache";
  226 
  227 ##### Hardcopy snippets are used in constructing a TeX file for hardcopy output.
  228 ##### They should contain TeX code unless otherwise noted.
  229 
  230 # The preamble is the first thing in the TeX file.
  231 $webworkFiles{hardcopySnippets}{preamble}       = "$webworkDirs{conf}/snippets/hardcopyPreamble.tex";
  232 
  233 # The setHeader preceeds each set. It is a PG file.
  234 $webworkFiles{hardcopySnippets}{setHeader}      = "$webworkDirs{conf}/snippets/setHeader.pg";  # hardcopySetHeader.pg",
  235 
  236 # The problem divider goes between problems.
  237 $webworkFiles{hardcopySnippets}{problemDivider} = "$webworkDirs{conf}/snippets/hardcopyProblemDivider.tex";
  238 
  239 # The set footer goes after each set. Is is a PG file.
  240 $webworkFiles{hardcopySnippets}{setFooter}      = "$webworkDirs{conf}/snippets/hardcopySetFooter.pg";
  241 
  242 # The set divider goes between sets (in multiset output).
  243 $webworkFiles{hardcopySnippets}{setDivider}     = "$webworkDirs{conf}/snippets/hardcopySetDivider.tex";
  244 
  245 # The user divider does between users (in multiuser output).
  246 $webworkFiles{hardcopySnippets}{userDivider}    = "$webworkDirs{conf}/snippets/hardcopyUserDivider.tex";
  247 
  248 # The postabmle is the last thing in the TeX file.
  249 $webworkFiles{hardcopySnippets}{postamble}      = "$webworkDirs{conf}/snippets/hardcopyPostamble.tex";
  250 
  251 ##### Screen snippets are used when displaying problem sets on the screen.
  252 
  253 # The set header is displayed on the problem set page. It is a PG file.
  254 $webworkFiles{screenSnippets}{setHeader}        = "$webworkDirs{conf}/snippets/setHeader.pg"; # screenSetHeader.pg"
  255 
  256 ################################################################################
  257 # Course-specific files
  258 ################################################################################
  259 
  260 # The course configuration file.
  261 $courseFiles{environment} = "$courseDirs{root}/course.conf";
  262 
  263 # File contents are displayed after login, on the problem sets page. Path given
  264 # here is relative to the templates directory.
  265 $courseFiles{course_info} = "course_info.txt";
  266 
  267 # File contents are displayed on the login page. Path given here is relative to
  268 # the templates directory.
  269 $courseFiles{login_info}  = "login_info.txt";
  270 
  271 # Additional library buttons can be added to the Library Browser (SetMaker.pm)
  272 # by adding the libraries you want to the following line.  For each key=>value
  273 # in the list, if a directory (or link to a directory) with name 'key' appears
  274 # in the templates directory, then a button with name 'value' will be placed at
  275 # the top of the problem browser.  (No button will appear if there is no
  276 # directory or link with the given name in the templates directory.)  For
  277 # example,
  278 #
  279 #     $courseFiles{problibs} = {rochester => "Rochester", asu => "ASU"};
  280 #
  281 # would add two buttons, one for the Rochester library and one for the ASU
  282 # library, provided templates/rochester and templates/asu exists.
  283 #
  284 $courseFiles{problibs}    = {};
  285 
  286 ################################################################################
  287 # Database options
  288 ################################################################################
  289 
  290 # Several database are defined in the file conf/database.conf and stored in the
  291 # hash %dbLayouts.
  292 include "conf/database.conf";
  293 
  294 # Select the default database layout. This can be overridden in the course.conf
  295 # file of a particular course. If you choose "gdbm", WeBWorK will be able to
  296 # use courses from WeBWorK 1 without first adding course.conf files to them.
  297 # However, the recommended database layout for new courses is "sql". This can
  298 # be set when creating a course.
  299 $dbLayoutName = "sql"; # or "gdbm";
  300 
  301 # This sets the symbol "dbLayout" as an alias for the selected database layout.
  302 *dbLayout     = $dbLayouts{$dbLayoutName};
  303 
  304 ################################################################################
  305 # Problem library options
  306 ################################################################################
  307 
  308 # The directory containing the problem library files. Set to "" if no problem
  309 # library is installed.
  310 $problemLibrary{root}        = "";
  311 
  312 # The name of the SQL database containing problem metadata
  313 $problemLibrary{sourceSQL}   = "ProblemLibrary";
  314 
  315 # The user name to use when connecting to the problem library database
  316 $problemLibrary{userSQL}     = "webworkRead";
  317 
  318 # The password to use when connecting to the problem library database
  319 $problemLibrary{passwordSQL} = "";
  320 
  321 ################################################################################
  322 # Logs
  323 ################################################################################
  324 
  325 # FIXME: take logs out of %webworkFiles/%courseFiles and give them their own
  326 # top-level hash.
  327 
  328 # Logs data about how long it takes to process problems. (Do not confuse this
  329 # with the /other/ timing log which can be set by WeBWorK::Timing and is used
  330 # for benchmarking system performance in general. At some point, this timing
  331 # mechanism will be deprecated in favor of the WeBWorK::Timing mechanism.)
  332 $webworkFiles{logs}{timing}         = "$webworkDirs{logs}/timing.log";
  333 
  334 # The transaction log contains data from each recorded answer submission. This
  335 # is useful if the database becomes corrupted.
  336 $webworkFiles{logs}{transaction}    = "$courseDirs{logs}/transaction.log";
  337 
  338 # The answer log stores a history of all users' submitted answers.
  339 $courseFiles{logs}{answer_log}      = "$courseDirs{logs}/answer_log";
  340 
  341 ################################################################################
  342 # More paths to external programs
  343 ################################################################################
  344 
  345 # These image conversion utilities are included in the WeBWorK distribution.
  346 $externalPrograms{gif2eps}  = "$webworkDirs{bin}/gif2eps";
  347 $externalPrograms{png2eps}  = "$webworkDirs{bin}/png2eps";
  348 $externalPrograms{gif2png}  = "$webworkDirs{bin}/gif2png";
  349 
  350 ################################################################################
  351 # Site defaults (FIXME: what other things could be "site defaults"?)
  352 ################################################################################
  353 
  354 # Status strings -- lists valid status values and their names. If your site uses
  355 # additional values, add them here.
  356 $siteDefaults{status} = {
  357   A        => "Audit",
  358   audit    => "Audit",
  359   D        => "Drop",
  360   drop     => "Drop",
  361   withdraw => "Drop",
  362   C        => "Enrolled",
  363   current  => "Enrolled",
  364   enrolled => "Enrolled",
  365 };
  366 
  367 ################################################################################
  368 # Frontend options
  369 ################################################################################
  370 
  371 %templates = (
  372   system => "$webworkDirs{conf}/templates/ur.template",
  373 );
  374 
  375 ################################################################################
  376 # Authorization system
  377 ################################################################################
  378 
  379 # This lets you specify a minimum permission level needed to perform certain
  380 # actions.  In the current system, >=10 will allow a professor to perform the
  381 # action, >=5 will allow a TA to, and >=0 will allow a student to perform an
  382 # action (almost never what you want).
  383 
  384 my $student   = 0;
  385 my $ta        = 5;
  386 my $professor = 10;
  387 my $nobody    = undef;
  388 
  389 %permissionLevels = (
  390   report_bugs                    => $student,
  391 
  392   view_multiple_sets             => $ta,
  393   view_unopened_sets             => $ta,
  394   view_unpublished_sets          => $ta,
  395   view_answers                   => $ta,
  396 
  397   become_student                 => $professor,
  398   access_instructor_tools        => $ta,
  399   score_sets                     => $professor,
  400   send_mail                      => $professor,
  401 
  402   create_and_delete_problem_sets => $professor,
  403   assign_problem_sets            => $professor,
  404   modify_problem_sets            => $professor,
  405   modify_student_data            => $professor,
  406 
  407   modify_classlist_files         => $professor,
  408   modify_set_def_files           => $professor,
  409   modify_scoring_files           => $professor,
  410   modify_problem_template_files  => $professor,
  411 
  412   create_and_delete_courses      => $professor,
  413   fix_course_databases           => $professor,
  414 
  415   ##### Behavior of the interactive problem processor #####
  416 
  417   show_correct_answers_before_answer_date         => $ta,
  418   show_solutions_before_answer_date               => $ta,
  419   avoid_recording_answers                         => $ta,
  420 
  421   check_answers_before_open_date                  => $ta,
  422   check_answers_after_open_date_with_attempts     => $ta,
  423   check_answers_after_open_date_without_attempts  => $student,
  424   check_answers_after_due_date                    => $student,
  425   check_answers_after_answer_date                 => $student,
  426 
  427   record_answers_when_acting_as_student           => $nobody,
  428 
  429   # "record_answers_when_acting_as_student" takes precedence
  430   # over the following for professors acting as students:
  431   record_answers_before_open_date                 => $nobody,
  432   record_answers_after_open_date_with_attempts    => $student,
  433   record_answers_after_open_date_without_attempts => $nobody,
  434   record_answers_after_due_date                   => $nobody,
  435   record_answers_after_answer_date                => $nobody,
  436 );
  437 
  438 ################################################################################
  439 # Session options
  440 ################################################################################
  441 
  442 # $sessionKeyTimeout defines seconds of inactivity before a key expires
  443 $sessionKeyTimeout = 60*30;
  444 
  445 # $sessionKeyLength defines the length (in characters) of the session key
  446 $sessionKeyLength = 40;
  447 
  448 # @sessionKeyChars lists the legal session key characters
  449 @sessionKeyChars = ('A'..'Z', 'a'..'z', '0'..'9', '.', '^', '/', '!', '*');
  450 
  451 # Practice users are users who's names start with $practiceUser
  452 # (you can comment this out to remove practice user support)
  453 $practiceUserPrefix = "practice";
  454 
  455 # There is a practice user who can be logged in multiple times.  He's
  456 # commented out by default, though, so you don't hurt yourself.  It is
  457 # kindof a backdoor to the practice user system, since he doesn't have a
  458 # password.  Come to think of it, why do we even have this?!
  459 #$debugPracticeUser = "practice666";
  460 
  461 ################################################################################
  462 # PG subsystem options
  463 ################################################################################
  464 
  465 # List of enabled display modes. Comment out any modes you don't wish to make
  466 # available for use.
  467 $pg{displayModes} = [
  468   "plainText",     # display raw TeX for math expressions
  469   "formattedText", # format math expressions using TtH
  470   "images",        # display math expressions as images generated by dvipng
  471   "jsMath",        # render TeX math expressions on the client side using jsMath
  472   "asciimath",     # render TeX math expressions on the client side using ASCIIMathML
  473 ];
  474 
  475 #### Default settings for the PG translator
  476 
  477 # Default display mode. Should be listed above.
  478 $pg{options}{displayMode}        = "images";
  479 
  480 # The default grader to use, if a problem doesn't specify.
  481 $pg{options}{grader}             = "avg_problem_grader";
  482 
  483 # Fill in answer blanks with the student's last answer by default?
  484 $pg{options}{showOldAnswers}     = 1;
  485 
  486 # Show correct answers (when allowed) by default?
  487 $pg{options}{showCorrectAnswers} = 0;
  488 
  489 # Show hints (when allowed) by default?
  490 $pg{options}{showHints}          = 0;
  491 
  492 # Show solutions (when allowed) by default?
  493 $pg{options}{showSolutions}      = 0;
  494 
  495 # Catch translation warnings internally by default? (We no longer need to do
  496 # this, since there is a global warnings handler. So this should be off.)
  497 $pg{options}{catchWarnings}      = 0;
  498 
  499 ##### Currently-selected renderer
  500 
  501 # Only the local renderer is supported in this version.
  502 $pg{renderer} = "WeBWorK::PG::Local";
  503 
  504 # The remote renderer connects to an XML-RPC PG rendering server.
  505 #$pg{renderer} = "WeBWorK::PG::Remote"'
  506 
  507 ##### Renderer-dependent options
  508 
  509 # The remote renderer has one option:
  510 $pg{renderers}{"WeBWorK::PG::Remote"} = {
  511   # The "proxy" server to connect to for remote rendering.
  512   proxy => "http://localhost:21000/RenderD",
  513 };
  514 
  515 ##### Settings for various display modes
  516 
  517 # "images" mode has several settings:
  518 $pg{displayModeOptions}{images} = {
  519   # Determines the method used to align images in output. Can be
  520   # "baseline", "absmiddle", or "mysql".
  521   dvipng_align => 'baseline',
  522 
  523   # If we choose mysql, we need information on connecting to the
  524   # database. Whatever you use here, you have to create the database
  525   # and grant read/write priveleges to the user listed here. To create
  526   # the database in mysql, as root use:
  527   #
  528   #     CREATE DATABASE DvipngDepths;
  529   #     USE DvipngDepths;
  530   #     CREATE TABLE depths (md5 CHAR(33) NOT NULL, depth SMALLINT, PRIMARY KEY (md5));
  531   #     GRANT ALL ON DvipngDepths.* TO webworkWrite;
  532   #
  533   # In the last statement, "webworkWrite" should match the user below.
  534   dvipng_depth_db => {
  535     dbsource => 'dbi:mysql:DvipngDepths',
  536     user     => $dbLayouts{sql}->{password}->{params}->{usernameRW},
  537     passwd   => $dbLayouts{sql}->{password}->{params}->{passwordRW},
  538   },
  539 };
  540 
  541 ##### Directories used by PG
  542 
  543 # The root of the PG directory tree (from pg_root in Apache config).
  544 $pg{directories}{root}   = "$pg_dir";
  545 $pg{directories}{lib}    = "$pg{directories}{root}/lib";
  546 $pg{directories}{macros} = "$pg{directories}{root}/macros";
  547 
  548 ##### "Special" PG environment variables. (Stuff that doesn't fit in anywhere else.)
  549 
  550 # Users for whom to print the file name of the PG file being processed.
  551 $pg{specialPGEnvironmentVars}{PRINT_FILE_NAMES_FOR} = [ "professor", ];
  552 
  553 # Locations of CAPA resources. (Only necessary if you need to use converted CAPA
  554 # problems.)
  555 $pg{specialPGEnvironmentVars}{CAPA_Tools}             = "$courseDirs{macros}/CAPA_Tools/",
  556 $pg{specialPGEnvironmentVars}{CAPA_MCTools}           = "$courseDirs{macros}/CAPA_MCTools/",
  557 $pg{specialPGEnvironmentVars}{CAPA_GraphicsDirectory} = "$courseDirs{html}/CAPA_Graphics/",
  558 $pg{specialPGEnvironmentVars}{CAPA_Graphics_URL}      = "$courseURLs{html}/CAPA_Graphics/",
  559 
  560 # Size in pixels of dynamically-generated images, i.e. graphs.
  561 $pg{specialPGEnvironmentVars}{onTheFlyImageSize}      = 400,
  562 
  563 ##### PG modules to load
  564 
  565 # The first item of each list is the module to load. The remaining items are
  566 # additional packages to import.
  567 
  568 ${pg}{modules} = [
  569   [qw(DynaLoader)],
  570   [qw(Exporter)],
  571   [qw(GD)],
  572 
  573   [qw(AlgParser AlgParserWithImplicitExpand Expr ExprWithImplicitExpand)],
  574   [qw(AnswerHash AnswerEvaluator)],
  575   [qw(WWPlot)], # required by Circle (and others)
  576   [qw(Circle)],
  577   [qw(Complex)],
  578   [qw(Complex1)],
  579   [qw(Distributions)],
  580   [qw(Fraction)],
  581   [qw(Fun)],
  582   [qw(Hermite)],
  583   [qw(Label)],
  584   [qw(List)],
  585   [qw(Match)],
  586   [qw(MatrixReal1)], # required by Matrix
  587   [qw(Matrix)],
  588   [qw(Multiple)],
  589   [qw(PGrandom)],
  590   [qw(Regression)],
  591   [qw(Select)],
  592   [qw(Units)],
  593   [qw(VectorField)],
  594 ];
  595 
  596 ##### Answer evaluatior defaults
  597 
  598 $pg{ansEvalDefaults} = {
  599   functAbsTolDefault            => .001,
  600   functLLimitDefault            => .0000001,
  601   functMaxConstantOfIntegration => 1E8,
  602   functNumOfPoints              => 3,
  603   functRelPercentTolDefault     => .1,
  604   functULimitDefault            => .9999999,
  605   functVarDefault               => "x",
  606   functZeroLevelDefault         => 1E-14,
  607   functZeroLevelTolDefault      => 1E-12,
  608   numAbsTolDefault              => .001,
  609   numFormatDefault              => "",
  610   numRelPercentTolDefault       => .1,
  611   numZeroLevelDefault           => 1E-14,
  612   numZeroLevelTolDefault        => 1E-12,
  613   useBaseTenLog                 => 0,
  614   defaultDisplayMatrixStyle     => "[s]",
  615 };
  616 
  617 ################################################################################
  618 # Compatibility
  619 ################################################################################
  620 
  621 # Define the old names for the various "root" variables.
  622 $webworkRoot    = $webworkDirs{root};
  623 $webworkURLRoot = $webworkURLs{root};
  624 $pgRoot         = $pg{directories}{root};