The minus(M1,M2) function performs matrix subtraction of M1 - M2.  If M2 is a scalar, then M2 is subtracted from each element of M2.

Arrays M1 and M2 must be the same size.

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

$\mathrm{M1}≔\mathrm{Matrix}\left(2\,3\,'\mathrm{fill}'=2\right)\:$

$\mathrm{M2}≔\mathrm{Matrix}\left(2\,3\,'\mathrm{fill}'=1\right)\:$

$\mathrm{Minus}\left(\mathrm{M1}\,\mathrm{M2}\right)$

$\left[\begin{array}{ccc}1& 1& 1\\ 1& 1& 1\end{array}\right]$