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 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@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@gmail.com
Date: Mon, 31 Aug 2015 17:49:51 -0400
To: yt-users@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@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@gmail.com
Date: Wed, 26 Aug 2015 17:50:44 -0400
To: yt-users@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@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@gmail.com
Date: Tue, 25 Aug 2015 09:54:31 -0400
To: yt-users@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@space.mit.edu
jzuhone@gmail.com
http://www.jzuhone.com

On Aug 25, 2015, at 9:41 AM, alex volioths <alex-volos@hotmail.com> wrote:

Hello everyone,

I've been practicing with the example "Creating a X-ray observation from an in-memory dataset" 

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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