[Radiance-general] problem of gencumulativesky driven through Python

Sat Feb 21 07:20:12 PST 2015

Thank you, Thomas and Alstan!

I need to check the use of Python's subprocess module.

Anyway, other than Alstan's way of constructing the command, the following
seems working as well. Am I using it correctly?

*import subprocess as spcmd = "GenCumulativeSky  +s1  -a 51.15  -o 0.18  -m
-0.0 -h 0  -E  -time 0 24  -date 1 1 12 31
./GBR_London.Gatwick.037760_IWEC.epw > ./gcs_LD.cal"process = sp.Popen(cmd,
shell=True)process.wait()print "OK!"*

On Fri, Feb 20, 2015 at 3:04 PM, J. Alstan Jakubiec <alstan at jakubiec.net>
wrote:

> --------
> WARNING: At least one of the links in the message below goes to an .exe
> file,
> which could be malicious. To learn how to protect yourself, please go here:
> https://commons.lbl.gov/x/_591B
> --------
> One correction to my previous post -- it does seem that, as was noted, the
> source code is available with Daysim 3. I didn't know that. I would presume
> that this is the corrected version, but I do not know for sure. If flipping
> your longitude input gives you better results, then it isn't.
>
> Alstan
>
> On 2/20/2015 2:42 PM, J. Alstan Jakubiec wrote:
>
> --------
> WARNING: At least one of the links in the message below goes to an .exe
> file,
> which could be malicious. To learn how to protect yourself, please go here:
> https://commons.lbl.gov/x/_591B
> --------
> Hi Joe,
>
> I haven't automated gencumulativesky through Python, but I do a fair
> amount of automation of Radiance commands using Python. I find that most
> commands will not work unless you run the command with shell emulation
> enabled. I'm not familiar with os.system or os.popen, but this is an
> example of my process using the subprocess module, and I hope it helps you.
>
> import subprocess as sp
>
> process = sp.Popen(['pcomb', '-e', '(expresssion)', fullpath_hdr_fname,
> '|', 'pvalue', '-d', '-b', '-h', '-H', '>', 'tmp.txt'], *shell=True*)
>
> process.wait()
>
>
> Note that the subprocess Popen command takes a list of individual command
> elements, and the shell=True portion is crucial.
>
> > *Moreover, I got a lot more error messages when running the
> gencumulativesky program directly in the terminal of Mac OS X using
> Singapore's weather file:*
> I am not sure where the 'official' gencumulative sky is available from
> these days, but we noticed an issue way back in 2012 thanks to some sleuthing
> from Ji Zhang
> <http://diva4rhino.com/forum/topics/gencumulativesky-exe-problem>, and a
> patched version was issued. Unfortunately, I only have the Windows binary
> of the fixed version, and the code is not open. A kind of dumb fix is to
> reverse your longitude input, as I believe the original version had issues
> with areas in the eastern hemisphere.
>
> Best,
> Alstan
>
> On 2/20/2015 12:21 AM, Thomas Bleicher wrote:
>
> Joe
>
>  I don't have a solution for your problem but on some previous versions
> of Mac OS X the standard Python installation had "issues". You could try
> installing a custom version from python.org.
>
>  Also, I recommend switching to os.popen instead of os.system. You have
> much more feedback from the output stream and any errors that show up.
> Converting the code is usually very easy.
>
>  Regards,
> Thomas
>
> On Wed, Feb 18, 2015 at 10:43 PM, Joe Smith <the.oat.cracker at gmail.com>
> wrote:
>
>>   ... to add a bit more info:
>>
>>  1. the same approach of using Python to execute Radiance programs works
>> fine on another Mac and Windows7 computers
>>
>>  2. I'm using *Python 2.7.9* for Mac
>>
>>  3. The Gencumulativesky executable is probably compiled from the source
>> code from Daysim3 ... but I'm not sure if it is the latest version ...
>>
>>  4. the Radiance is version *4.3.a.2* installed from *https://github.com/NREL/Radiance/releases/download/4.3.a.2/radiance-4.3.a-Darwin.dmg
>> <https://github.com/NREL/Radiance/releases/download/4.3.a.2/radiance-4.3.a-Darwin.dmg>*
>>
>>  Thanks!
>>
>> On Thu, Feb 19, 2015 at 11:32 AM, Joe Smith <the.oat.cracker at gmail.com>
>> wrote:
>>
>>>   Hi, guys,
>>>
>>> I don't know if you can kindly advise me on a Python related problem, or
>>> suggest a source for help:
>>>
>>> 1. the following gencumulativesky command runs OK in the terminal of Mac
>>> OS using London's weather file:
>>> *GenCumulativeSky  +s1  -a 51.15  -o 0.18  -m -0.0 -h 0  -E  -time 0 24
>>> -date 1 1 12 31 ./London.epw > ./gcs_London.cal*
>>>
>>>  ... with two lines of error message:
>>>
>>>
>>> *There were 4586 sun up hours in this climate file Total Ibh/Lbh:
>>> 0.000000 *
>>>
>>> 2. But I can't get it working at all by running a Python script with the
>>> following contents:
>>>
>>>
>>> *import os cmd = "GenCumulativeSky  +s1  -a 51.15  -o 0.18  -m -0.0
>>> -h 0  -E  -time 0 24  -date 1 1 12 31 ./London.epw > ./gcs_London.cal"
>>> os.system(cmd)*
>>>
>>>  There is no error message in the Python IDLE, but the .cal file
>>> generated is zero ...
>>>
>>>
>>>  Moreover, I got a lot more error messages when running the
>>> gencumulativesky program directly in the terminal of Mac OS X using
>>> Singapore's weather file:
>>>
>>>  Command:
>>> *GenCumulativeSky  +s1  -a 1.37  -o -103.98  -m -120.0    -h 0  -E
>>> -time 0 24  -date 1 1 12 31 ./SGP_Singapore.486980_IWEC.epw > ./gcs_SG.cal*
>>>
>>>  Errors:
>>>
>>>
>>>
>>>
>>> *Error!  Solar altitude < 6 degrees and Idh > 10 W/m^2 on day 1!
>>> Attempting to continue! ...... Error!  Solar altitude < 6 degrees and Idh >
>>> 10 W/m^2 on day 365!  Attempting to continue! There were 4354 sun up hours
>>> in this climate file Total Ibh/Lbh: 0.000000*
>>>
>>>
>>>  Thanks for your help!
>>>
>>
>>
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