[LON-CAPA-users] {Disarmed} RE: Formula response won't recognize "pi"

[SIMIN, GRIGORY]

hk,
Great suggestion!
Thank you!
Grigory

From: LON-CAPA-users <lon-capa-users-bounces at mail.lon-capa.org> On Behalf Of H. K. Ng
Sent: Thursday, November 21, 2019 2:12 PM
To: Discussion list for LON-CAPA users <lon-capa-users at mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Formula response won't recognize "pi"

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:image001.jpg at 01D5A07B.29C6BE90]



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




_______________________________________________
LON-CAPA-users mailing list
LON-CAPA-users at mail.lon-capa.org<mailto:LON-CAPA-users at mail.lon-capa.org>
https://urldefense.com/v3/__http://mail.lon-capa.org/mailman/listinfo/lon-capa-users__;!!PhOWcWs!npThfddABuFrPgPy2N5gLLGz_02Hs0mlKSiyGgd0QGK0jAvPgqAmVRpO7BG6$<https://protect2.fireeye.com/v1/url?k=08ef73c5-547d3b52-08ef3d04-ac1f6b0e682e-6a612b1b2a925639&q=1&e=07e34fb4-6e4c-47e6-be96-5e86706f4920&u=https%3A%2F%2Furldefense.com%2Fv3%2F__http%3A%2F%2Fmail.lon-capa.org%2Fmailman%2Flistinfo%2Flon-capa-users__%3B%21%21PhOWcWs%21npThfddABuFrPgPy2N5gLLGz_02Hs0mlKSiyGgd0QGK0jAvPgqAmVRpO7BG6%24>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.lon-capa.org/pipermail/lon-capa-users/attachments/20191121/140e0d71/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 8375 bytes
Desc: image001.jpg
URL: <http://mail.lon-capa.org/pipermail/lon-capa-users/attachments/20191121/140e0d71/attachment-0001.jpg>