times 2\)</span> matrix variable <code>a</code> and assigns a copy
of the value of <code>b</code> to the variable <code>a</code>. The variable <code>b</code> must
be of type <code>matrix</code> for the statement to be well formed. For
the code to execute successfully, <code>b</code> must be the same shape as <code>a</code>,
but this cannot be validated until run time. Because a copy is
assigned, subsequent changes to <code>a</code> do not affect <code>b</code> and subsequent
changes to <code>b</code> do not