[ww-bugs] Bug 3716: New: Context("Fraction") does not allow error in decimal answers.

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3716

           Summary: Context("Fraction") does not allow error in decimal
                    answers.
           Product: PG
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: MathObjects
        AssignedTo: dpvc at union.edu
        ReportedBy: goehle at gmail.com
        Web browser ---
           version:


According to the documentation in contextFraction.pl when using
Context("Fraction") students should be able to submit decimal answers. However
when using this context decimal answers are required to be exactly equal which
makes it impossible to enter fractions with repeating decimal expansions.  I
did find a problem in the wild that uses contextFraction.pl in this way.  In
Library/Rochester/setIntegrals14Substitution/csuf_in_14_1.pg with seed 1247 the
answer is -20/7, which has a repeating decimal expansion, and the problem does
not ask for a fraction answer.  I don't know what side effects there would be
(if any) of adding a tolerance to the fraction comparator.  

Test code:
DOCUMENT();      

loadMacros(
    'PGstandard.pl',
    'PGML.pl',
    'contextFraction.pl',
);

TEXT(beginproblem());

Context('Fraction');

$A = Fraction(-20,7)->reduce;
$B = Fraction(1,2)->reduce;

BEGIN_PGML
Enter 2.85714285714 :
[`` [$A] = ``] [______________________]{$A} 

Enter .5 :
[`` [$B] = ``] [______________________]{$B} 
END_PGML

ENDDOCUMENT();

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