[LON-CAPA-users] More elegant conditional text?

[Todd Ruskell]

Thanks all.  Turns out <parse> is exactly what I was looking for, as it
allows me to include even more than just mathematics in the random
block, although the &xmlparse() would also have worked.

Todd

Gerd Kortemeyer wrote:
> Hi,
> 
> On Feb 7, 2008, at 7:46 PM, Ray Batchelor wrote:
>>
>> <script type="loncapa/perl">$a='$ \mathrm{KE}_1=(1/2)M_1v_1^2 $';
>> $b='$ \mathrm{E}_2=M_2c^2 $';
>> $c='$ \mathrm{P}_3=M_3v_3^2 $';
>>
>> $choice=&random(0,2,1);
>>
>> @array=($a,$b,$c);</script>
>> <startouttext /><p><m eval="on"> $array[$choice] </m></p><endouttext />
>>
>> Possibly someone can tell me that this is not robust?
> 
> I believe it's equally robust. Incorporating Ray's solution, we have
> four magic incantations:
> 
> <problem>
> <script type="loncapa/perl">
> $array[1] = '<m>$E=mc^2$</m>';
> $array[2] = &xmlparse('<m>$\nabla E=\varrho/\varepsilon_0$</m>');
> $array[3] = '$E=mv^2/2$';
> $array[4] = '\nabla\times E=-\partial B/\partial t';
> </script>
> <startouttext />
> It is <parse>$array[1]</parse>, but also <display>$array[2]</display> -
> strange.
> And there is always <m eval="on">$array[3]</m> and <m eval="on">$
> $array[4] $</m>.
> <endouttext />
> </problem>
> 
> As always in LON-CAPA, the number of possibilities is limitless ... or
> at least four.
> 
> - Gerd.
> 
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-- 
Dr. Todd Ruskell
Senior Lecturer, Department of Physics       Office:  Meyer Hall 326
Colorado School of Mines                     Phone: 303-384-2080
1523 Illinois Street                         Fax: 303-273-3919
Golden, CO 80401