lt <code>f[2]</code> of supplying a single index to a
matrix is the indexed row, here row 2 of matrix <code>f</code>.</p>
</div>
<div id="partial-array-assignment" class="section level3 unnumbered">
<h3>Partial Array Assignment</h3>
<p>Subarrays of arrays may be assigned by indexing on the left-hand side
of an assignment statement. For example, the following is legal.</p>
<pre class="stan"><code>real x[I,J,K];
real y[J,K];
real z[K];
// ...
x[1] = y;
x[1,1] = z;</code></pre>
<p>The sizes must match. Here, <