Difference between revisions of "PointsInAnswers"

Revision as of 01:27, 24 January 2010

This PG code shows how to check student answers that are points.

PG problem file	Explanation
DOCUMENT(); loadMacros( "PGstandard.pl", "contextLimitedPoint.pl", "PGcourse.pl", ); TEXT(beginproblem());	Initialization: We load the `contextLimitedPoint.pl` macro which automatically loads `MathObjects.pl`. The LimitedPoint context does not allow operations between points. Alternatively, instead of loading `contextLimitedPoint.pl`, we could have loaded `MathObjects.pl` and `parserVectorUtils.pl`. This would allow operations, such as addition and subtraction, between points.
Context("LimitedPoint"); $f = Formula("2-x"); $xint = Point("(2,0)"); $yint = Point("(0,2)");	Setup: Everything is as usual. If we had loaded `parserVectorUtils.pl` instead, we would use `Context("Vector2D");` for two-dimensional space or `Context("Vector");` for three-dimensional space.
Context()->texStrings; BEGIN_TEXT If $ y = f(x) = $f $, find the x- and y-intercepts. Enter your answers as points $ (a,b) $ that include parentheses. $BR x-intercept: \{ ans_rule(15) \} $BR y-intercept: \{ ans_rule(15) \} END_TEXT Context()->normalStrings;	Main Text: The main text section of the file is as we'd expect.
ANS( $xint->cmp() ); ANS( $yint->cmp() ); ENDDOCUMENT();	Answer Evaluation: As is the answer.

@@ Line 76: / Line 76: @@
 Context()->texStrings;
 BEGIN_TEXT
-If \( y = f(x) = $f \), find
+If \( y = f(x) = $f \), find the x- and y-intercepts.
-the x- and y-intercepts.  Enter your
+Enter your answers as points \( (a,b) \) that include parentheses.
-answers as points \( (a,b) \) that
-include parentheses.
 $BR
 x-intercept: \{ ans_rule(15) \}