PointAnswers1

Answer is a Point or a List of Points

This PG code shows how to evaluate answers that are points or lists of points.

• Download file: File:PointAnswers1.txt (change the file extension from txt to pg when you save it)
• File location in NPL: NationalProblemLibrary/FortLewis/Authoring/Templates/Precalc/PointAnswers1.pg

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PG problem file	Explanation
Problem tagging data	Problem tagging:
DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "contextLimitedPoint.pl", ); TEXT(beginproblem());	Initialization: We only need to load contextLimitedPoint.pl if we want to prevent operations between points.
Context("LimitedPoint"); $f = Compute("x^2-1"); $xint = List( Point("(1,0)"), Point("(-1,0)") ); $yint = List( Point("(0,-1)") );	Setup: We could have used Context("Point"); instead, which would allow mathematical operations between points (such as adding points as if they were vectors). The x-intercepts are clearly a list of points. We used a list with only one element for the y-intercepts so that a student who mistakenly enters two points will not get a warning message.
Context()->texStrings; BEGIN_TEXT Enter the x-intercept(s) and y-intercept(s) of \( y = $f \). Enter a point as \( (a,b) \), including the parentheses. If there is more than one correct answer, enter a comma separated list of points. $BR $BR x-intercept(s): \{ ans_rule(20) \} \{ AnswerFormatHelp("points") \} $BR y-intercept(s): \{ ans_rule(20) \} \{ AnswerFormatHelp("points") \} END_TEXT Context()->normalStrings;	Main Text:
$showPartialCorrectAnswers = 1; ANS( $xint->cmp() ); ANS( $yint->cmp() );	Answer Evaluation:
Context()->texStrings; BEGIN_SOLUTION ${PAR}SOLUTION:${PAR} Solution explanation goes here. END_SOLUTION Context()->normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT();	Solution:

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