[yt-users] problem with units

[John ZuHone]

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
jzuhone at gmail.com
http://www.jzuhone.com

> On Aug 25, 2015, at 9:41 AM, alex volioths <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 
> 
> 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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