[Radiance-general] gendaymtx returns -1.#J -1.#J -1.#J

[Gregory J. Ward]

Hi Mostapha,

Thanks for sending your files.  For some reason, your WEA file has the month and day columns swapped, which is the source of your error.  What did you use to translate the EPW file?  The latest HEAD includes Christoph Reinharts epw2wea program, which does the correct translation.  With the correct input, gendaymtx seems to produce appropriate output.

Best,
-Greg

> From: Greg Ward <gward at lmi.net>
> Date: October 3, 2013 8:37:15 AM PDT
> 
> Hi Mostapha,
> 
> This sounds like a bug in gendaymtx.  Some versions of the standard library print out "-1.#J" for NaN (Not a Number), which can result from a divide-by-zero or similar illegal math operation.  If you send me your weather file in a separate message (not to the mailing list), I will see if I can reproduce the problem.  There may be a corner case or two that gendaymtx still doesn't deal with gracefully.
> 
> Cheers,
> -Greg
> 
>> From: Mostapha Sadeghipour <sadeghipour at gmail.com>
>> Date: October 2, 2013 1:37:49 PM PDT
>> 
>> Hi all,
>> 
>> I tried to read the results of the gendaymtx with a custom script and I noticed that there are multiple values of  -1.#J -1.#J -1.#J for RGB. Does anybody know why this is happening?
>> 
>> I'm trying to get the total solar radiation for sky patches (-O1). I'm running RADIANCE on Windows and here is the line:
>> 
>> gendaymtx -m 1 -O1 .\USA_AK_Anchorage.Intl.AP.702730_TMY3.wea> .\USA_AK_Anchorage.Intl.AP.702730_TMY3.mtx
>> 
>> Thanks in advance,
>> Mostapha
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