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## Revision as of 21:03, 14 February 2008

## A First ~WeBWorK Sample Problem, Alternate Version

*This sample problem shows the basic structure of a WeBWorK PG problem file and how it is constructed. This is different from the default first sample in that it uses "old-style" answer checkers instead of the more flexible MathObjects.*

A standard WeBWorK PG file has five sections:

- A
*tagging and description section*, that describes the problem for future users and authors, - An
*initialization section*, that loads required macros for the problem, - A
*problem set-up section*that sets variables specific to the problem, - A
*text section*, that gives the text that is shown to the student, and - An
*answer and solution section*, that specifies how the answer(s) to the problem is(are) marked for correctness, and gives a solution that may be shown to the student after the problem set is complete.

Below, the contents of the PG problem file are shown to the left, with a second column to the right that explains the different parts of the problem that are indicated above.

PG problem file | Explanation |
---|---|

# DESCRIPTION # A simple sample problem that asks students to # differentiate a trigonometric function. # WeBWorK problem written by Gavin LaRose, # <glarose(at)umich(dot)edu> # ENDDESCRIPTION ## DBsubject('WeBWorK') ## DBchapter('Demos') ## DBsection('Problem') ## KEYWORDS('') ## TitleText1('') ## EditionText1('') ## AuthorText1('') ## Section1('') ## Problem1('') ## Author('Gavin LaRose') ## Institution('UMich') |
This is the The description is provided to give a quick summary of the problem so that someone reading it later knows what it does without having to read through all of the problem code. All of the tagging information exists to allow the problem to be easily indexed. Because this is a sample problem there isn't a textbook per se, and we've used some default tagging values. There is an on-line list of current chapter and section names and a similar list of keywords. The list of keywords should be comma separated and quoted (e.g., KEYWORDS('calculus,derivatives')). |

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "PGcourse.pl", ); |
This is the
The |

# make sure we're in the context we want # Context("Numeric"); $a = random(2,9,1); $trigFuncTeX = "\sin($a x)"; $trigDeriv = "$a*cos($a*x)"; $trigDerivTeX = "$a \cos($a x)"; |
This is the
The bulk of the set-up section defines variables that we use in the rest of the problem. All |

TEXT(&beginproblem); # Context()->texStrings; BEGIN_TEXT Find the derivative of the function \(f(x) = $trigFuncTeX\). $PAR \(\frac{df}{dx} = \) \{ ans_rule(35) \} END_TEXT # Context()->normalStrings; |
This is the
Mathematical equations are delimited by
There are a number of variables that set formatting: |

ANS( fun_cmp($trigDeriv) ); # Context()->texStrings; SOLUTION(EV3(<<'END_SOLUTION')); $PAR SOLUTION $PAR We find the derivative to this using the chain rule. The inside function is \($a x\), so that its derivative is \($a\), and the outside function is \(\sin(x)\), which has derivative \(\cos(x)\). Thus the solution is \[ \frac{d}{dx} $trigFuncTeX = $trigDerivTeX. \] END_SOLUTION # Context()->normalStrings; ENDDOCUMENT(); |
This is the Then, we explain the solution to the student. This solution will show up when the student clicks the "show solution" checkbox after they've finished the problem set.
The |