ple indexes is defined to respect the
following distributivity conditions.</p>
<pre class="stan"><code>m[idxs1, idxs2][i, j] = m[idxs1[i], idxs2[j]]
m[idxs, idx][j] = m[idxs[j], idx]
m[idx, idxs][j] = m[idx, idxs[j]]</code></pre>
<p>Evaluation of arrays of matrices and arrays of vectors or row vectors
is defined recursively, beginning with the array dimensions.</p>
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