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PG Labs

On-line labs for rendering of PG code. These two labs allow you to experiment with PG syntax.

Test your PG code fragments

Click on this link to go to PG calculator:

For example you could enter the code fragment below into the calculator:

$f = Compute("x^2-3x+5");
$fp = $f->D; # calculate the derivative
 checkAnswer($fp, "2x-3");      # the first argument is a MathObject, the second the student's answer string
  • On the last line TEXT prints the results of (reading from left to right)
    • Constructing the AnswerEvaluator for the contents of the Formula $fp
    • Evaluating the string "2x-3" using this AnswerEvaluator to produce an AnswerHash
    • Recursively representing the contents of the AnswerHash in a nice table
  checkAnswer() inserts its arguments into a more complicated command.  e.g. last line above becomes:
  TEXT($fp->cmp->evaluate("2x-3")->pretty_print );  -- or this complicated command can be replaced by the command below

PGML markup lab

  • Experiment with the new PG markup language syntax (PGML) which simplifies the graphical layout of the mathematics question. This is not yet available in the rel-2-4-patches release of WeBWorK but can be used if you update the pg code to HEAD. This is fairly safe since no modifications of configuration files are needed and existing problems are not likely to be affected. (The code base on has been updated to HEAD and will run PGML.)

Homework sets using PGML

 To use these commands in your own courses you will need a recent version of PG.  (You can update by changing 
 to the /opt/pg directory and typing
 cvs update -A   
 which will get you the latest version of all of the PG code
 You can move back to the more stable code base by typing
 cvs update -r rel-2-4-patches
Include in your loadMacros() segment.
Start the display of your problem text with BEGIN_PGML which expands to
 and end with END_PGML  
 These are used instead of the usual  BEGIN_TEXT/END_TEXT construct. You can use both BEGIN_TEXT/END_TEXT and BEGIN_PGML/END_PGML in the same question.