The evalM command uses MATLAB® to evaluate an expression constructed with MATLAB® syntax.

Matlab[evalM] does not return the result of the evaluation. To capture the result, preface the expression with a MATLAB® variable name. For example, to multiply matrices A and B, use the command Matlab[evalM]("C=A*B"), followed by Matlab[getvar]("C"). Ensure that A and B are already defined in MATLAB®.

If an error occurs during the evaluation of the expression, Maple returns a generic error message. Since Maple cannot obtain strings from MATLAB®, there is no way for Maple to determine the specific cause of the error.  If you want to determine the cause of the error, switch to an open MATLAB® window (if possible) and enter the LASTERR command.

Executing the evalM command returns a null.

$\mathrm{with}\left(\mathrm{Matlab}\right)\:$

$\mathrm{maplematrix\_a}≔\mathrm{Matrix}\left(\left[\left[3\,3\,2\right]\,\left[4\,5\,2\right]\,\left[6\,2\,4\right]\right]\right)$

$\mathrm{maplematrix\_a}≔\left[\begin{array}{ccc}3& 3& 2\\ 4& 5& 2\\ 6& 2& 4\end{array}\right]$

$\mathrm{maplematrix\_b}≔\mathrm{Matrix}\left(\left[\left[3\,2\,5\right]\,\left[1\,8\,2\right]\,\left[7\,3\,4\right]\right]\right)$

$\mathrm{maplematrix\_b}≔\left[\begin{array}{ccc}3& 2& 5\\ 1& 8& 2\\ 7& 3& 4\end{array}\right]$

$\mathrm{Matlab}\left[\mathrm{setvar}\right]\left(''matlabmatrix\_a''\,\mathrm{maplematrix\_a}\right)$

$\mathrm{Matlab}\left[\mathrm{setvar}\right]\left(''matlabmatrix\_b''\,\mathrm{maplematrix\_b}\right)$

$\mathrm{Matlab}\left[\mathrm{evalM}\right]\left(''c=inv(matlabmatrix\_b)*matlabmatrix\_a\text{'}''\right)$

$\mathrm{Matlab}\left[\mathrm{getvar}\right]\left(''c''\right)$