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Question: Grading code not simplifying properly... Help!

Question:Grading code not simplifying properly... Help!

andrewc 5
mapleta
August 19 2010
1

Hi,

I've recently started creating questions using MapleTA, and at the moment I've hit a stumbling block.

For a particular question, the students need to enter a formula. When I input the answer in decimal form, the question is graded correctly; when I put it in fractional form, it's not. I've used the simplify command in every perturbation I know, but I can't get it to work.

More details:

Algorithm

$a = rint(3,10)
condition:not(eq($a,0))
$b = $a/2*rint(-7,7)
condition:not(eq($b,0))
condition:not(eq($b,1))
condition:not(eq($b,$a))
condition:not(eq($b,-$a))


$re = maple("MathML[ExportPresentation]( ($a*(X[n]))+($b*(X[n-1])) = 0)")
$s = -$b/$a

 

Question:

Consider the recursion formula $re.

Give the general solution Xn=Edit where A is an arbitrary constant.

 

Solution box has:

Answer: (A)*($s)^n

and I've also tried

Answer: simplify((A)*($s)^n);

I've tried the following grading codes:

is($ANSWER-RESPONSE=0);

is(simplify($ANSWER)-simplify($RESPONSE)=0);

...and others like that, in different combinations.

 

Without fail, if $s is not an integer, then an otherwise correct answer expressed as a fraction is marked wrong.

Please help!

-A
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