[LON-CAPA-admin] Perl Script Function "ln" supported?

[Stefan Bisitz]

Ok, this needs to work again. I've filed a bug report:
http://bugs.loncapa.org/show_bug.cgi?id=6629

Stefan Bisitz


Am 20.11.2012 15:31 schrieb Lucas, Mark:
> The particular problem on which this issue occurred is
>
> http://capa2.phy.ohiou.edu/res/ohiou/OUp250lib/SHM/dampedspring.problem
>
> It has been used in the past without these error messages.
>
> On capa2 and capa4 (our two library servers), I don't see any error in construction
> space or in student space.
>
> I upgraded most of my access servers to Centos 6 in the summer, but did not
> mess with my library servers because of time issues. It may be that there is
> a new perl library with newer releases.
>
> Mark
>
> On Nov 20, 2012, at 8:51 AM, Stefan Bisitz wrote:
>
>> Hi Mark,
>>
>> Thanks for your information.
>>
>> I just talked to the LON-CAPA administrator of the domain where the
>> issue occurred "here" for the first time. He confirmed the issue, as CC
>> and AU. It's an Ubuntu Server with 64 Bit.
>>
>> Sorry to ask again: Are you sure you don't get an error message in
>> Construction Space? We get the error message on the other server and on
>> our (development) server where the function doesn't work.
>> ----------------
>> <problem>
>> <script type="loncapa/perl">
>> $a = ln(0.05);
>> </script>
>> <startouttext />
>> a: $a
>> <endouttext />
>> </problem>
>> ----------------
>>
>> I need to ask more:
>> Do you have evidence that these problems using ln() have ever worked on
>> the machines where the error occurs now?
>>
>>  From what we found in our debugging session yesterday (nothing...), we
>> still wonder where and how this function is offered by LON-CAPA anyway.
>>
>> I plan to file a bug report - especially if it can be confirmed that the
>> function should work, used to work and doesn't work anymore.
>>
>> Stefan Bisitz
>>
>>
>> Am 19.11.2012 20:51 schrieb Lucas, Mark:
>>> Stefan,
>>>
>>> I was just getting ready to ask about this. We had this pop up just last night.
>>>
>>> We had an instructor start getting 'bombs' on a problem that uses ln().
>>>
>>> It did not get caught in construction space.
>>>
>>> I just checked out a problem and I get the error messages on all our access
>>> servers when I log in as a student and check out problem, but I don't get the
>>> message on our library servers when I do the same thing. I also, as stated
>>> above, do not get the error message in construction space (necessarily in
>>> construction space).
>>>
>>> What is different about perl on the library servers? One of my library servers
>>> is 64-bit (Centos5.3) and the other is 32-bit (Centos 5.3).
>>>
>>> Mark
>>>
>>> On Nov 19, 2012, at 12:59 PM, Stefan Bisitz wrote:
>>>
>>>> Hi,
>>>>
>>>> The perl script function "ln" (not "log" or "log10") seems to be
>>>> supported by LON-CAPA, but not officially. The Script Functions help
>>>> doesn't list it and it's not a perl function.
>>>>
>>>> The issue:
>>>> Some LON-CAPA servers do not support "ln" and complain "Undefined
>>>> subroutine &main::ln ..." while others calculate the correct value.
>>>>
>>>> So, why does it work on some servers? Should it work on all? If so, why
>>>> isn't it currently?
>>>>
>>>> Any hints?
>>>>
>>>> Thanks,
>>>> Stefan Bisitz
>>>> _______________________________________________
>>>> LON-CAPA-admin mailing list
>>>> LON-CAPA-admin at mail.lon-capa.org
>>>> http://mail.lon-capa.org/mailman/listinfo/lon-capa-admin
>>>
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