_lupdf</code></strong><code>(vector theta | vector alpha)</code><br>
The log of the Dirichlet density for simplex theta given prior counts
(plus one) alpha dropping constant additive terms</p>
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<p></p>
<p><code>vector</code> <strong><code>dirichlet_rng</code></strong><code>(vector alpha)</code><br>
Generate a Dirichlet variate with prior counts (plus one) alpha; may
only be used in transformed data and generated quantities blocks</p>

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