Guy Albertelli II lon-capa-users@mail.lon-capa.org
Thu, 20 Oct 2005 15:27:25 -0400 (EDT)

```Hi Donnell,

> Hi..  I was looking at your example for formula response located here:
> http://help.lon-capa.org/fom/cache/115.html
>
> using this example without changing anything thing, I get that:
>
> y = (13-6)/(8-4)*x+6-(13-6)/(8-4)*4
>
> and that's cool..
>
> however, if you simplify that to -1 + 1.75*x and enter this in as your
> answer, Lon-CAPA says that this is wrong.

I'm confused. The example is expecting an answer like "3.8*x^3+2.1*y^2"

(I.e. involving both x and y)

So I don't get how you got an = in there (did you assume that
3.8*x^3+2.1*y^2 = 0  and then solve for y?)

And I don't get how lon-capa could have accepted
(13-6)/(8-4)*x+6-(13-6)/(8-4)*4
as a correct answer ... since it also fails to include y.

What random seed are you testing on?

> If formula response acts by
> comparing both expressions over a set range of values, why doesn't this
> work? Matlab says it works..
>
>
> Donnell
>
> -----Original Message-----
> [mailto:lon-capa-users-admin@mail.lon-capa.org] On Behalf Of Guy
> Albertelli II
> Sent: Wednesday, October 19, 2005 6:17 PM
> To: lon-capa-users@mail.lon-capa.org
> Subject: Re: [LON-CAPA-users] Implicit Answer Response
>
> Hi Donnell,
>
> > In my script, I have this:
> >
> > \$A = -\$temp;
> > \$w = \$vPart2;
> >
> > \$iCurrent = \$A*cos(\$w*t);
>
> Should do:
>
>   \$iCurrent = "\$A*cos(\$w*t)";
>
>
> > And, in a part of my .problem, I have this:
> >
> >     <responseparam description="Numerical Tolerance" type="tolerance"
> > default="0.00001" name="tol" />
> >     <textline size="25"/>
> >     <hintgroup>
> >     <startouttext /><endouttext />
> >     </hintgroup>
> > </formularesponse>
> >
> >
> > Yet, when I try to enter an answer, it just says that it is " Unable
> to
> > understand formula"
>
>
> --
> guy@albertelli.com   0-7-2-1-27,137
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>
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--
guy@albertelli.com   0-7-2-1-27,137

```