[yt-users] problem with units

John ZuHone jzuhone at gmail.com
Tue Sep 1 06:35:20 PDT 2015


Hi Alex,

Ok, so this actually makes things a bit simpler. You have one of two options. 

You can install one of our nightly development packages. The upside to this is that you will get the bugfix that was recently applied. The downside to this is that you will also get experimental changes that have been merged in lately, which may be unstable. 

If you want to install this version, you can use this command: 

conda install -c https://conda.binstar.org/jzuhone/channel/dev <https://conda.binstar.org/jzuhone/channel/dev> yt

which will update you to last night’s development version. 

Alternatively, we will be updating the stable conda package with a bugfix release very soon (maybe in the next week or so), so if you want you can wait for that and I will be sure to let you know when it comes out. 

Best,

John

> On Sep 1, 2015, at 3:23 AM, alex volioths <alex-volos at hotmail.com> wrote:
> 
> Hi John, 
> 
> thank you for your time and help. 
> 
> I used conda to install yt.
> I am using Ubuntu  14 LTS but I am a newbie. 
> 
> Again, thank you.
> Alex 
> 
> From: jzuhone at gmail.com
> Date: Mon, 31 Aug 2015 17:49:51 -0400
> To: yt-users at lists.spacepope.org
> Subject: Re: [yt-users] problem with units
> 
> Hi Alex,
> 
> Sorry—the delays on my end are longer than yours. 
> 
> We’ve fixed this bug, but I’m still a little unclear as to how you installed yt. 
> 
> You’re using spyder to run the script, but I don’t think you can install yt using spyder, so you must have used “pip install yt” to install it, or maybe you installed it from source. Do you remember how you did it?
> 
> Also, is this Linux or Mac OS X?
> 
> Best,
> 
> John
> 
> On Aug 29, 2015, at 1:28 PM, alex volioths <alex-volos at hotmail.com <mailto:alex-volos at hotmail.com>> wrote:
> 
> Hi John,
> 
> I am sorry for the late reply.
> 
> I use spyder which   comes with  modules installed.
> 
> Thank you for your help!
> Alex
> 
> From: jzuhone at gmail.com <mailto:jzuhone at gmail.com>
> Date: Wed, 26 Aug 2015 17:50:44 -0400
> To: yt-users at lists.spacepope.org <mailto:yt-users at lists.spacepope.org>
> Subject: Re: [yt-users] problem with units
> 
> 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 <mailto: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 <mailto:jzuhone at gmail.com>
> Date: Tue, 25 Aug 2015 09:54:31 -0400
> To: yt-users at lists.spacepope.org <mailto: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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