[LON-CAPA-users] Duplicated ids found (SOLVED!)
Itay Furman
itayf at nospammail.net
Wed Oct 30 23:33:47 EDT 2013
Hi,
As suggested by Raymond I manually change the id in the imported
library file, and that solved the problem.
In my original problem file I did not include id attribute for the
import tag. The id="11" was added automatically during publication.
Although the automatic addition of id attributes is documented, I
missed that point until the error hit me.
Thank again,
Itay
On Sun, 27 Oct 2013, Itay Furman wrote:
> Date: Sun, 27 Oct 2013 22:46:34 +0200 (IST)
> From: Itay Furman <itayf at nospammail.net>
> To: Discussion list for LON-CAPA users <lon-capa-users at mail.lon-capa.org>
> Subject: Re: [LON-CAPA-users] Duplicated ids found
>
> On Sun, 27 Oct 2013, Raymond Batchelor wrote:
>
>> It seems to me that the id="11" is used within the imported file (which
>> imports yet another library file) and redundantly in the actual problem
>> file to import the first library file. I think you 'might' want to use an
>> id other than "11" in your problem file, for the import.
>
> I see.
> I will make the changes and test them later, when the questions will not be
> in active use.
>
> Thanks,
> Itay
>
>>
>> ----- Original Message -----
>> From: "Itay Furman" <itayf at nospammail.net>
>> To: lon-capa-users at mail.lon-capa.org
>> Sent: Sunday, 27 October, 2013 08:45:18
>> Subject: [LON-CAPA-users] Duplicated ids found
>>
>> Hi,
>>
>> This is problem a newbie question. But I didn't find information on
>> this. Sorry for that.
>>
>> After publishing a problem I get the following error message:
>>
>> [start]
>> ERROR: Duplicated ids found, problem will operate incorrectly.
>> Duplicated ids seen:
>> 11
>> This error occurred while processing response 12 in part
>> [end]
>>
>> I could find in my code only a single id="11".
>> Note that the numerical ids in
>> <import id="11">/res/jce/itayf/pub/lib/const_phys.library</import>
>> and
>> <numericalresponse unit="C" format="2E" answer="$q" id="12">
>> were added by lon-capa after publication.
>>
>> The code follows below.
>>
>> Thanks in advance,
>> Itay
>>
>> [start code]
>> <problem>
>> <comment>
>> File = elec_coulomb_identical-hanging-charges.problem
>> Author = Itay Furman, PhD, itayf at fastmail.fm
>> Created = 2013-10-08
>> Updated = 2013-10-08
>> Version = 0.01
>>
>> Source = Expanded from a problem by Michael Friedberg, JCE.
>> </comment>
>>
>> <import id="11">/res/jce/itayf/pub/lib/const_phys.library</import>
>>
>> <script type="loncapa/perl">
>> # Set-up
>>
>> $k_coulomb = $Coulomb_Const;
>> $g = 9.8; # Gravity acceleration [m
>> / s^2].
>> $len = &random(10, 50, 5); # String length [cm].
>> $theta = &random(4,25,1); # Angle between string
>> and vertical [degrees].
>> $th_rad = $theta* $Pi / 180; # Same angle [rad].
>> $mass = &random(5,80,5); # Body mass [g].
>>
>> # Compute the magnitude of the charge on each body.
>> $q = 2 * ($len/100) * sin($th_rad) * sqrt(($mass/1000) * $g *
>> tan($th_rad) / $k_coulomb);
>> # Note the following factors are required:
>> # 1/100 in ($len/100) to convert $len: [cm] -> [m].
>> # 1/1000 in ($mass/1000) to convert $mass: [g] -> [kg].
>> # $Pi/180 in ($theta*$Pi/180) to convert sin()'s arg: [deg] -> [Rad].
>> </script>
>>
>> <startouttext />
>> <h2>The Electrostatic Force Between a Pair of Identical Hanging Point
>> Charges</h2>
>>
>> <p>
>> Two point bodies, each having a mass of <num>$mass</num> [g], are
>> connected to identical massless
>> isolating strings whose length is <num>$len</num> [cm].
>> The strings are connected to the same hook on the ceiling.
>> </p>
>> <p>
>> The bodies carry identical charges.
>> Therefore, due to electrostatic repulsion, each string is inclined with
>> an angle of
>> $theta<sup>o</sup> relative to the line that pass through the hook and
>> is orthogonal to the
>> ceiling.
>> </p>
>> <endouttext />
>>
>> <part id="q" display="Compute the charge.">
>> <startouttext />
>> <strong>Compute: </strong> the electric charge on each body is
>> <endouttext />
>>
>> <numericalresponse unit="C" format="2E" answer="$q" id="12">
>> <responseparam name="tol" type="tolerance" default="2%"
>> description="Numerical Tolerance" />
>> <textline readonly="no" />
>> </numericalresponse>
>> </part>
>>
>> <img alt="A pair of identical hanging charged masses."
>> src="/res/jce/itayf/pub/share/img/131012_pair-hanging-charges.jpg"
>> encrypturl="no" />
>> <allow
>> src="/res/jce/itayf/pub/share/img/131012_pair-hanging-charges.jpg" />
>> </problem>
>>
>> [end code]
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>>
>>
>
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