. The matrix and the vector
must have the same number of rows.</p>
<!-- matrix; append_col; (vector x, matrix y); -->
<p></p>
<p><code>matrix</code> <strong><code>append_col</code></strong><code>(vector x, matrix y)</code><br>
Combine vector x and matrix y by columns. The vector and the matrix
must have the same number of rows.</p>
<!-- matrix; append_col; (vector x, vector y); -->
<p></p>
<p><code>matrix</code> <strong><code>append_col</code></strong><code>(vector x, vector y)</code><br>
Combine vectors x 