I'm afraid I do not have an answer to your question, but have you considered coding this problem as a mathresponse problem?
Best regards, Justin -- *Justin Gray* Senior Lecturer | Department of Mathematics Simon Fraser University | SCK 10531 8888 University Dr., Burnaby, B.C. V5A 1S6 Canada Simon Fraser University is located on the Unceded Coast Salish Territories of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples On Fri, Oct 23, 2020 at 1:18 PM Itay <it...@nospammail.net> wrote: > 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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