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Hi folks,
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<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>
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<div>I tried doing ds.omega_baryon = 0.048, but I still get</div>
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/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>
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<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>
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<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>
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<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>
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<span style="color: #2de621"> 280</span> <span style="color: #34bd26">
return</span> True</p>
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281<span style="color: #f5f5f5"> </span></p>
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<span style="color: #c33720">NeedsParameter</span>: (['omega_baryon'])</p>
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<div>when I try to plot using baryon_overdensity. Suggestions?</div>
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<div>Thanks,</div>
<div>—Molly</div>
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