<p><code>int</code> <strong><code>cols</code></strong><code>(vector x)</code><br>
The number of columns in the vector x, namely 1</p>
<!-- int; cols; (row_vector x); -->
<p></p>
<p><code>int</code> <strong><code>cols</code></strong><code>(row_vector x)</code><br>
The number of columns in the row vector x</p>
<!-- int; cols; (matrix x); -->
<p></p>
<p><code>int</code> <strong><code>cols</code></strong><code>(matrix x)</code><br>
The number of columns in the matrix x</p>
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