irst array dimension
a = m[3:4, 5];  // knock off second array dimension</code></pre>
<p>In both assignments, the multiple index knocks off an array dimension,
but it’s different in both cases. In the first case, <code>a[i] ==   m[1, i + 1]</code>, whereas in the second case, <code>a[i] == m[i + 2,   5]</code>.</p>
<p>Continuing the previous example, consider the following.</p>
<pre><code>...
vector[2] b;
b = a[1, 3, 2:3, 2];</code></pre>
<p>Here, the two array dimensions are reduced as is the column dime