<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 16, 2016 at 12:09 PM, David Collins <span dir="ltr"><<a href="mailto:dcollins4096@gmail.com" target="_blank">dcollins4096@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Haha, that is my greatest downfall. I hope I didn't take you away from vital tasks like watching for trucks.<div><div>I'll take a look at that PR. </div><div>I have a related stupid question-- With the conda-style install, what's the easiest way to switch between yt builds?</div></div></div></blockquote><div><br></div><div>Do you mean switch between different yt versions? If so it's identical to before. You navigate to the repo, pull in the changes you want to update to, update to them, and do "setup.py develop".</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span class="HOEnZb"><font color="#888888"><div><br></div><div>d.</div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 15, 2016 at 5:38 PM, Nathan Goldbaum <span dir="ltr"><<a href="mailto:nathan12343@gmail.com" target="_blank">nathan12343@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Well, Dave nerd-sniped me:<div><br></div><div><a href="https://bitbucket.org/yt_analysis/yt/pull-requests/2176" target="_blank">https://bitbucket.org/yt_analysis/yt/pull-requests/2176</a><br></div><div><br></div><div>Hopefully this will be in yt 3.3.</div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 13, 2016 at 5:05 PM, Nathan Goldbaum <span dir="ltr"><<a href="mailto:nathan12343@gmail.com" target="_blank">nathan12343@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If there aren't any particles, then (in my example) ('CenOstriker', 'creation_time') won't be in ds.field_list, so you could do something like:<div><br></div><div> if field in ds.field_list:</div><div> nparticles = ad[field].shape[0]</div><div> else:</div><div> nparticles = 0</div><span><font color="#888888"><div><br></div></font></span><div><span><font color="#888888">Nathan</font></span><div><div><span></span><br><br>On Friday, May 13, 2016, David Collins <<a href="mailto:dcollins4096@gmail.com" target="_blank">dcollins4096@gmail.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><br></div><div>Cool. I may try my hand at such an object.</div><div><br></div><div>The problem with doing something like ad['CenOstriker','creation_time'] is that if there are no particles it raises an error, so for smooth flying I'd need to put it in a try/except, but that's not a huge deal.</div><div><br></div><div><br></div><div>Thanks!</div><div>d.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 13, 2016 at 4:42 PM, Nathan Goldbaum <span dir="ltr"><<a>nathan12343@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">This uses the ActiveParticleCosmology dataset from <a href="http://yt-project.org/data" target="_blank">yt-project.org/data</a>:<div><br></div><div><div> import yt</div><div> ds = yt.load('ActiveParticleCosmology/DD0046/DD0046')</div><div> ad = ds.all_data()</div><div> print(ad['CenOstriker', 'creation_time'].shape)</div></div><div><br></div><div>Which prints out (899755,), so there are 899755 active particles in this simulation.</div><div><br></div><div>There isn't a convenience function to get the number of each particle type in the simulation. Adding such a convenience function (or populating some Dataset attribute with this information when we load the data so we don't need to make another I/O pass over the dataset) would be a great addition to yt. There's even a very long-standing issue opened by me about this...</div><div><br></div><div><a href="https://bitbucket.org/yt_analysis/yt/issues/718" target="_blank">https://bitbucket.org/yt_analysis/yt/issues/718</a><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Fri, May 13, 2016 at 3:32 PM, David Collins <span dir="ltr"><<a>dcollins4096@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Hi, Everybody!<div><br></div><div>Is there a field or function that totals the number of active particles? I see that I can get it from the grid, but I don't see anything for the whole ds.</div><div><br></div><div>Thanks,</div><div>d.<span><font color="#888888"><br clear="all"><div><br></div>-- <br><div><div dir="ltr">-- Sent from a computer.<br></div></div>
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