<div dir="ltr">Hi Molly,<div><br></div><div>If this is a tipsy dataset, you can specify it on read-in:</div><div><br></div><div><a href="http://yt-project.org/docs/dev/examining/loading_data.html#specifying-tipsy-cosmological-parameters-and-setting-default-units">http://yt-project.org/docs/dev/examining/loading_data.html#specifying-tipsy-cosmological-parameters-and-setting-default-units</a><br></div><div><br></div><div>Not sure about other types of frontends.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 1, 2016 at 8:42 AM, Molly Peeples <span dir="ltr"><<a href="mailto:molly@stsci.edu" target="_blank">molly@stsci.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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Hi folks,
<div><br>
</div>
<div>I have a dataset I’d like to add omega_baryon to (I want to use the baryon_overdensity derived field, but it seems to only have omega_matter and omega_lambda, but I know what omega_baryon is). It’s not a derived field; it’s just a number (not sure what
 the yt-lingo for it is!)…</div>
<div><br>
</div>
<div>I tried doing ds.omega_baryon = 0.048, but I still get</div>
<div>
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<br>
</p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(52,189,38);background-color:rgb(0,0,0)">
/Users/molly/anaconda2/envs/astroconda/lib/python2.7/site-packages/yt/fields/derived_field.pyc<span style="color:#f5f5f5"> in
</span><span style="color:#34bbc7">__call__</span><span style="color:#5330e1">(self, data)</span></p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(245,245,245);background-color:rgb(0,0,0)">
<span style="color:#2de621">    277</span>                 doesnt_have<span style="color:#5330e1">.</span>append<span style="color:#5330e1">(</span>p<span style="color:#5330e1">)</span></p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(245,245,245);background-color:rgb(0,0,0)">
<span style="color:#2de621">    278</span>         <span style="color:#34bd26">
if</span> len<span style="color:#5330e1">(</span>doesnt_have<span style="color:#5330e1">)</span>
<span style="color:#5330e1">></span> <span style="color:#34bbc7">0</span><span style="color:#5330e1">:</span></p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(245,245,245);background-color:rgb(0,0,0)">
<span style="color:#34bd26">--> 279</span><span style="color:#c33720">            
</span><span style="color:#34bd26">raise</span> NeedsParameter<span style="color:#5330e1">(</span>doesnt_have<span style="color:#5330e1">)</span></p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(245,245,245);background-color:rgb(0,0,0)">
<span style="color:#2de621">    280</span>         <span style="color:#34bd26">
return</span> True</p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(45,230,33);background-color:rgb(0,0,0)">
    281<span style="color:#f5f5f5"> </span></p>
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<br>
</p>
<p style="margin:0px;font-size:10px;font-family:Monaco;color:rgb(245,245,245);background-color:rgb(0,0,0)">
<span style="color:#c33720">NeedsParameter</span>: (['omega_baryon'])</p>
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<br>
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<div>when I try to plot using baryon_overdensity. Suggestions?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>—Molly</div>
</div>

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<br></blockquote></div><br></div>