# MatchingStaticGraphs

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## Matching Problems That Have Static Graphic Images

*This code shows how to create a matching problem for functions and their graphs.
Students input their answers using drop-down select lists (popup lists).
*

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

DOCUMENT(); loadMacros( "PG.pl", "PGbasicmacros.pl", "PGchoicemacros.pl", "PGanswermacros.pl", ); |
Initialization: We need to include the |

@questions = ( "\( f(x,y) = \displaystyle \frac{1}{x^2 + y^2} \)", "\( f(x,y) = - y^2 \)", "\( f(x,y) = x^3 - \sin(y) \)", "\( f(x,y) = x + 2y + 3 \)", "\( f(x,y) = - e^{-x^2 - y^2} \)", ); @images = ( "12-2-9a.gif", "12-2-9b.gif", "12-2-9c.gif", "12-2-9d.gif", "12-2-9e.gif", ); $n = scalar(@questions); $k = $n; # $k can be less than $n @subset = NchooseK($n,$k); |
Set-up: This is probably the only section you need to modify. Create an array of questions (functions) and a corresponding array of images. Set the number of questions displayed, $k, manually if you like. You probably don't want more than five graphs to be displayed. Image files must be GIF or PNG and be located in the same directory as the pg file. |

@subset_of_questions = @questions[@subset]; @subset_of_images = @images[@subset]; @permutation = NchooseK($k,$k); @shuffled_subset_of_images = @subset_of_images[@permutation]; @captions = @ALPHABET[0..$k-1]; TEXT(beginproblem()); BEGIN_TEXT $BEGIN_ONE_COLUMN Match each function with its graph. If you click on a graph, a larger graph will appear in a new window. $BR$BR END_TEXT for $j (1..$k) { BEGIN_TEXT $j. \{ pop_up_list(['?', @captions]) \} $SPACE @subset_of_questions[$j-1] $BR$BR END_TEXT } BEGIN_TEXT \{imageRow(~~@shuffled_subset_of_images,~~@captions)\} $END_ONE_COLUMN END_TEXT |
Main Text: You may modify the instructions if you want. |

$showPartialCorrectAnswers = 0; ANS(str_cmp([@ALPHABET[invert(@permutation)]])); ENDDOCUMENT(); |
Answer Evaluation: You should not need to modify this section at all. |