<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 23, 2016 at 3:43 PM, Io Odderskov <span dir="ltr"><<a href="mailto:io.odderskov@gmail.com" target="_blank">io.odderskov@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">Dear Yt-users.<div><br></div><div>I have just started used Yt, which I find to be very useful. However, I am having trouble converting the units of the output of the HaloMassFcn-function to match other data sets. </div><div><br></div><div>I have tried comparing the Tinker 2008 fitting function produced by HaloMassFcn to the halo mass function from the Halo Finder Comparison Project (<a href="https://arxiv.org/pdf/1104.0949v1.pdf" target="_blank">https://arxiv.org/pdf/1104.0949v1.pdf</a>) and to a halo catalogue from the DEUS consortium (<a href="http://www.deus-consortium.org/deuvo/#download" target="_blank">http://www.deus-consortium.org/deuvo/#download</a>). In these cases, the halo masses are given in Msun/h, and the cumulative halo number density in h^3/Mpc^3. According to the Yt-documentation, the masses output by the HaloMassFcn-function should be in Msun, and the number densities in 1/Mpc^3. To convert to Msun/h and h^3/Mpc^3, I multiply the masses by h, and divide the number densities with h^3. In the attached figure, this corresponds to the line labelled "Tinker2008 - masses multiplied by h", which does not match the other data sets very well. If I instead divide the masses by h, I get the line labelled Tinker2008 - masses divided by h", which looks much better. But I really can't see how to justify this conversion. </div></div></blockquote><div><br></div><div>To convert to Msun/h, you're trying to multiply by h? I don't think that's right --- dividing by h is the correct thing to do.</div><div> </div><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>I hope you can help me figure out what I'm doing wrong :-) <br></div><div>Thanks in advance!</div><div><br></div><div>Best regards, Io. </div><div><br></div><div>script: <a href="http://paste.yt-project.org/show/6530/" target="_blank">http://paste.yt-project.org/show/6530/</a></div><div>image <a href="http://imgur.com/otWW3QJ" target="_blank">http://imgur.com/otWW3QJ</a></div><div><br></div><div>version: </div><div><font face="monospace, monospace"> </font></div><div><font face="monospace, monospace"> Version = 3.2.3</font></div><div><font face="monospace, monospace"> Changeset = bdea84d95099 (stable) @</font></div><div><br></div><div>P.S. When I tried to do "yt upload_image", I got a 404 error. Perhaps imgur changed their API?</div></div></blockquote><div><br></div><div>Yeah, imgur changed their API. This is fixed in the development branch of yt but hasn't been backported to the stable branch. Perhaps we should do a 3.2.4 release given than 3.3 is taking a bit longer than anticipated to release.</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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