[yt-users] problem with units

[John ZuHone]

Alex, 

My apologies—this is a bug in the code. I have a fix, which I hope to have ready by tonight or tomorrow.

Just a quick question—how did you install yt? It looks like your Python stack is in /usr/local. 

Best,

John

> On Aug 26, 2015, at 3:26 AM, alex volioths <alex-volos at hotmail.com> wrote:
> 
> Hello John
> 
> I am using spyder to run the script. Spyder is using the 1.8.2 version.
> 
> Cheers
> Alex
> 
> From: jzuhone at gmail.com
> Date: Tue, 25 Aug 2015 09:54:31 -0400
> To: yt-users at lists.spacepope.org
> Subject: Re: [yt-users] problem with units
> 
> Hi Alex,
> 
> Sorry for the trouble--I'll see if I can figure out what's gone wrong on this end.
> 
> It looks like you're running yt 3.2--can you tell me what version of NumPy you are running?
> 
> Best,
> 
> John
> 
> John ZuHone
> Kavli Center for Astrophysics and Space Research
> Massachusetts Institute of Technology
> 77 Massachusetts Ave. <>, 37-582G
> Cambridge, MA 02139 <>
> (w) 617-253-2354 <>
> (m) 781-708-5004 <>
> jzuhone at space.mit.edu <mailto:jzuhone at space.mit.edu>
> jzuhone at gmail.com <mailto:jzuhone at gmail.com>
> http://www.jzuhone.com <http://www.jzuhone.com/>
> 
> On Aug 25, 2015, at 9:41 AM, alex volioths <alex-volos at hotmail.com <mailto:alex-volos at hotmail.com>> wrote:
> 
> Hello everyone,
> 
> I've been practicing with the example "Creating a X-ray observation from an in-memory dataset" 
> from here http://yt-project.org/doc/analyzing/analysis_modules/photon_simulator.html <http://yt-project.org/doc/analyzing/analysis_modules/photon_simulator.html> 
> 
> However even with simple copy and paste after defining the photons I get this error message:
> 
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 685, in runfile
> execfile(filename, namespace)
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 78, in execfile
> builtins.execfile(filename, *where)
> 
> 
> File "/home/afi/Documents/X_ray_sim/X_mock.py", line 75, in <module>
> exp_time, thermal_model, center="c")
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/analysis_modules/photon_simulator/photon_simulator.py", line 330, in from_scratch
> photons = photon_model(data_source, parameters)
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/analysis_modules/photon_simulator/photon_models.py", line 140, in __call__
> kT_bins = np.linspace(kT_min, max(my_kT_max, kT_max), num=n_kT+1)
> 
> 
> File "/usr/lib/python2.7/dist-packages/numpy/core/function_base.py", line 87, in linspace
> step = (stop-start)/float((num-1))
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/units/yt_array.py", line 745, in __sub__
> ro = sanitize_units_add(self, right_object, "subtraction")
> 
> 
> File "/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/units/yt_array.py", line 134, in sanitize_units_add
> raise YTUnitOperationError(op_string, inp.units, dimensionless)
> 
> 
> YTUnitOperationError: The subtraction operator for YTArrays with units (keV) and (1) is not well defined.
> 
> 
> Any ideas? I am new to yt and i can't see something wrong.
> 
> 
> Thnak you
> Alex
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