[Radiance-general] problem of gencumulativesky driven through Python

Sat Feb 21 08:04:09 PST 2015

Sorry, guys, it seems the following works in Windows ONLY.

*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()*

... on Mac the above only produces an empty .cal file ... (tested via both
Python 2.7 and Python 3.4 for Mac)

Neither do the following which generates no .cal file ...

*process = sp.Popen(['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'], shell=True)*

I'm suspecting something's wrong about the Python installed on my Mac ...

Anyway, it works in Windows at least ...

On Sat, Feb 21, 2015 at 11:20 PM, Joe Smith <the.oat.cracker at gmail.com>
wrote:

> 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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>>>
>>>
>>
>>
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