[LON-CAPA-users] Formula response won't recognize "pi"
H. K. Ng
hkng at fsu.edu
Thu Nov 21 14:11:42 EST 2019
Hi,
Formularesponse using cas with maxima works great.
<problem>
<script type="loncapa/perl">
$ansa = &cas('maxima','1/sqrt(4*pi^2*L*C)');
</script>
<startouttext />What is formula for resonant frequency for an LC circuit? <endouttext /><br />
<startouttext /><m>$ \omega_{res} = $</m><endouttext />
<formularesponse answer="$ansa" id="12">
<textline readonly="no" />
</formularesponse>
</problem>
Regards,
-hk
On Thu, Nov 21, 2019 at 11:05 AM SIMIN, GRIGORY <SIMIN at engr.sc.edu<mailto:SIMIN at engr.sc.edu>> wrote:
Hi all!
I've found a strange issue in some problems requiring formula response.
I have a simple question to enter the formula for the resonant frequency.
An example of correct answer is (in other variations the formula could be a bit more complex than this one)
1/(2*pi*sqrt(L*C))
The correct solution is checked by sampling L and C values.
When I am entering the answer, I can see that LON-CAPA recognizes it because it displays the formatted formula as I am entering it:
[cid:16e8f5cf6cc6917eb1]
But when I press submit, I got the response:
“unable to understand formula”
By experimenting with this, I found that the issue happens because of “pi” being a part of the answer.
If pi is replaced with 3.141, everything would work.
But it feels weird asking students to enter 3.141 instead of pi; besides, I don’t even want to give them a hint that pi is a part of the answer.
Why is this happening? Apparently LON-CAPA knows what “pi” means because it displays it correctly.
Thanks!
Grigory
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