Hi I am trying to develop a custom response problem in which the student submission is a vector. A minimal example is provided below. Regardless of what I typed in the either of the two input fields I get the response: 'This question expects a numeric answer.'
Please advise what am I doing wrong? Thanks in advance. Itay <problem> <!-- begin minimal --> <script type="loncapa/perl"> $ax = &random(1.0, 10, 0.1); # Coordinates of \vec{a} $ay = &random(1.0, 10, 0.1); </script> <startouttext /> Consider a vector <m eval="on">\( \vec{a} = $ax\hat{x} + $ay\hat{y} \)</m>'. Provide a vector <m>\( \vec{b} \)</m>, orthogonal to <m>\( \vec{a} \)</m>. <br /> <endouttext /> <customresponse id="dotProd"> <answer type="loncapa/perl"> for ($i=0; $i<2; $i++) { # Test input sanity. if ($submission[i] =~ /^\d+\s+\w+$/) { return 'UNIT_NOTNEEDED'; } if ($submission[i] !~ /^[\d\.]+$/) { return 'WANTED_NUMERIC'; } } # Is submission correct? $dotProd = $ax * $submission[0] + $ay * $submission[1]; if (abs($dotProd) < 1.0e-3) { return 'APPROX_ANS'; } # Can't expect EXACT_ANS. return 'INCORRECT'; </answer> <startouttext /><m>\( b_x = \)</m><endouttext /> <textline size="10" readonly="no" spellcheck="none" /> <startouttext /><br /><endouttext /> <startouttext /><m>\( b_y = \)</m><endouttext /> <textline size="10" readonly="no" spellcheck="none" /> <startouttext /><br /><endouttext /> </customresponse> </problem> <!-- end minimal -->
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