<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Alex,<div class=""><br class=""></div><div class="">Ok, so this actually makes things a bit simpler. You have one of two options. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">If you want to install this version, you can use this command: </div><div class=""><br class=""></div><div class="">conda install -c <a href="https://conda.binstar.org/jzuhone/channel/dev" class="">https://conda.binstar.org/jzuhone/channel/dev</a> yt</div><div class=""><br class=""></div><div class="">which will update you to last night’s development version. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">John</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Sep 1, 2015, at 3:23 AM, alex volioths <<a href="mailto:alex-volos@hotmail.com" class="">alex-volos@hotmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Calibri; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">Hi John,<span class="Apple-converted-space"> </span><br class=""><br class="">thank you for your time and help.<span class="Apple-converted-space"> </span><br class=""><br class="">I used conda to install yt.<br class="">I am using Ubuntu 14 LTS but I am a newbie.<span class="Apple-converted-space"> </span><br class=""><br class="">Again, thank you.<br class="">Alex<span class="Apple-converted-space"> </span><br class=""><br class=""><hr class="">From: <a href="mailto:jzuhone@gmail.com" class="">jzuhone@gmail.com</a><br class="">Date: Mon, 31 Aug 2015 17:49:51 -0400<br class="">To: <a href="mailto:yt-users@lists.spacepope.org" class="">yt-users@lists.spacepope.org</a><br class="">Subject: Re: [yt-users] problem with units<br class=""><br class="">Hi Alex,<div class=""><br class=""></div><div class="">Sorry—the delays on my end are longer than yours. </div><div class=""><br class=""></div><div class="">We’ve fixed this bug, but I’m still a little unclear as to how you installed yt. </div><div class=""><br class=""></div><div class="">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?</div><div class=""><br class=""></div><div class="">Also, is this Linux or Mac OS X?</div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">John</div><div class=""><br class=""><div class=""><blockquote class=""><div class="">On Aug 29, 2015, at 1:28 PM, alex volioths <<a href="mailto:alex-volos@hotmail.com" class="">alex-volos@hotmail.com</a>> wrote:</div><br class="ecxApple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Calibri; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px;" class="">Hi John,<br class=""><br class="">I am sorry for the late reply.<br class=""><br class="">I use spyder which comes with modules installed.<br class=""><br class="">Thank you for your help!<br class="">Alex<br class=""><br class=""><hr class="">From:<span class="Apple-converted-space"> </span><a href="mailto:jzuhone@gmail.com" class="">jzuhone@gmail.com</a><br class="">Date: Wed, 26 Aug 2015 17:50:44 -0400<br class="">To:<span class="Apple-converted-space"> </span><a href="mailto:yt-users@lists.spacepope.org" class="">yt-users@lists.spacepope.org</a><br class="">Subject: Re: [yt-users] problem with units<br class=""><br class="">Alex, <div class=""><br class=""></div><div class="">My apologies—this is a bug in the code. I have a fix, which I hope to have ready by tonight or tomorrow.</div><div class=""><div class=""><br class=""></div><div class="">Just a quick question—how did you install yt? It looks like your Python stack is in /usr/local. </div><div class=""><br class=""></div><div class="">Best,</div><div class=""><br class=""></div><div class="">John</div><div class=""><br class=""><div class=""><blockquote class=""><div class="">On Aug 26, 2015, at 3:26 AM, alex volioths <<a href="mailto:alex-volos@hotmail.com" class="">alex-volos@hotmail.com</a>> wrote:</div><br class="ecxApple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Calibri; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px;" class="">Hello John<div class=""><br class=""></div><div class="">I am using spyder to run the script. Spyder is using the 1.8.2 version.</div><div class=""><br class=""></div><div class="">Cheers</div><div class="">Alex</div><div class=""><br class=""><div class="">From:<span class="ecxApple-converted-space"> </span><a href="mailto:jzuhone@gmail.com" class="">jzuhone@gmail.com</a><br class="">Date: Tue, 25 Aug 2015 09:54:31 -0400<br class="">To:<span class="ecxApple-converted-space"> </span><a href="mailto:yt-users@lists.spacepope.org" class="">yt-users@lists.spacepope.org</a><br class="">Subject: Re: [yt-users] problem with units<br class=""><br class=""><div class="">Hi Alex,</div><div id="ecxAppleMailSignature" class=""><br class=""></div><div id="ecxAppleMailSignature" class="">Sorry for the trouble--I'll see if I can figure out what's gone wrong on this end.</div><div id="ecxAppleMailSignature" class=""><br class=""></div><div id="ecxAppleMailSignature" class="">It looks like you're running yt 3.2--can you tell me what version of NumPy you are running?</div><div id="ecxAppleMailSignature" class=""><br class=""></div><div id="ecxAppleMailSignature" class="">Best,</div><div id="ecxAppleMailSignature" class=""><br class=""></div><div id="ecxAppleMailSignature" class="">John<br class=""><br class=""><span style="font-size: 13pt; background-color: rgba(255, 255, 255, 0);" class="">John ZuHone</span><br class=""><div class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Kavli Center for Astrophysics and Space Research<br class="">Massachusetts Institute of Technology<br class=""><a target="_blank" class="">77 Massachusetts Ave.</a>, 37-582G<br class=""><a target="_blank" class="">Cambridge, MA 02139</a><br class="">(w) <a target="_blank" class="">617-253-2354</a><br class="">(m) <a target="_blank" class="">781-708-5004</a><br class=""><a href="mailto:jzuhone@space.mit.edu" class="">jzuhone@space.mit.edu</a><br class=""><a href="mailto:jzuhone@gmail.com" class="">jzuhone@gmail.com</a><br class=""><a href="http://www.jzuhone.com/" target="_blank" class="">http://www.jzuhone.com</a></span><br style="font-family: UICTFontTextStyleBody;" class=""></div></div><div class=""><br class="">On Aug 25, 2015, at 9:41 AM, alex volioths <<a href="mailto:alex-volos@hotmail.com" class="">alex-volos@hotmail.com</a>> wrote:<br class=""><br class=""></div><blockquote class=""><div class=""><div dir="ltr" class="">Hello everyone,<div class=""><br class=""></div><div class="">I've been practicing with the example "Creating a X-ray observation from an in-memory dataset" </div><div class="">from here <a href="http://yt-project.org/doc/analyzing/analysis_modules/photon_simulator.html" target="_blank" style="font-size: 12pt;" class="">http://yt-project.org/doc/analyzing/analysis_modules/photon_simulator.html</a> </div><div class=""><br class=""></div><div class="">However even with simple copy and paste after defining the photons I get this error message:</div><div class=""><br class=""></div><div class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">685</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">runfile</span><br class="">execfile(filename, namespace)<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">78</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">execfile</span><br class="">builtins.execfile(filename, *where)<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/home/afi/Documents/X_ray_sim/X_mock.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">75</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class=""><module></span><br class="">exp_time, thermal_model, center="c")<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/analysis_modules/photon_simulator/photon_simulator.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">330</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">from_scratch</span><br class="">photons = photon_model(data_source, parameters)<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/analysis_modules/photon_simulator/photon_models.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">140</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">__call__</span><br class="">kT_bins = np.linspace(kT_min, max(my_kT_max, kT_max), num=n_kT+1)<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/lib/python2.7/dist-packages/numpy/core/function_base.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">87</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">linspace</span><br class="">step = (stop-start)/float((num-1))<br class=""><br class=""><br class="">File<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/units/yt_array.py"</span>, line<span class="ecxApple-converted-space"> </span><span style="color: rgb(0, 100, 0);" class="">745</span>, in<span class="ecxApple-converted-space"> </span><span style="color: rgb(148, 0, 211);" class="">__sub__</span><br class="">ro = sanitize_units_add(self, right_object, "subtraction")<br class=""><br class=""><br class=""><span style="color: rgb(70, 130, 180);" class="">File<span class="ecxApple-converted-space"> </span></span><span style="color: rgb(0, 100, 0);" class="">"/usr/local/lib/python2.7/dist-packages/yt-3.2-py2.7-linux-x86_64.egg/yt/units/yt_array.py"</span><span style="color: rgb(70, 130, 180);" class="">, line<span class="ecxApple-converted-space"> </span></span><span style="color: rgb(0, 100, 0);" class="">134</span><span style="color: rgb(70, 130, 180);" class="">, in<span class="ecxApple-converted-space"> </span></span><span style="color: rgb(148, 0, 211);" class="">sanitize_units_add</span><br class=""><span style="color: rgb(139, 0, 0);" class="">raise YTUnitOperationError(op_string, inp.units, dimensionless)</span><br class=""><br class=""><br class=""><span style="color: rgb(139, 0, 0);" class="">YTUnitOperationError:</span><span class="ecxApple-converted-space"> </span>The subtraction operator for YTArrays with units (keV) and (1) is not well defined.<br class=""><br class=""><br class="">Any ideas? I am new to yt and i can't see something wrong.<br class=""><br class=""><br class="">Thnak you<br class="">Alex<br class=""></div><h2 style="box-sizing: border-box; font-family: Raleway, 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.1; color: rgb(51, 51, 51); font-size: 34px; height: 45px; visibility: hidden; background-color: rgb(255, 255, 255);" class=""></h2><h2 style="box-sizing: border-box; font-family: Raleway, 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.1; color: rgb(51, 51, 51); font-size: 34px; height: 45px; visibility: hidden; background-color: rgb(255, 255, 255);" class=""></h2></div></div></blockquote><blockquote class=""><div class=""><span class="">_______________________________________________</span><br class=""><span class="">yt-users mailing list</span><br class=""><span class=""><a href="mailto:yt-users@lists.spacepope.org" class="">yt-users@lists.spacepope.org</a></span><br class=""><span class=""><a href="http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org" target="_blank" class="">http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org</a></span><br class=""></div></blockquote><br class="">_______________________________________________ yt-users mailing list<span class="ecxApple-converted-space"> </span><a href="mailto:yt-users@lists.spacepope.org" class="">yt-users@lists.spacepope.org</a><span class="ecxApple-converted-space"> </span><a href="http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org" target="_blank" class="">http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org</a></div></div></div><span style="font-family: Calibri; 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