For an integer M, ceil(M) is the smallest integer greater than or equal to M.

The ceil(M) function on a matrix, M, computes the element-wise ceil of M. The result, R is formed as R[i,j] = ceil(M[i,j]).

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

$M≔\mathrm{Matrix}\left(2\,3\,'\mathrm{fill}'=-3.6\right)\:$

$\mathrm{ceil}\left(M\right)$

$\left[\begin{array}{ccc}\mathrm{-3}& \mathrm{-3}& \mathrm{-3}\\ \mathrm{-3}& \mathrm{-3}& \mathrm{-3}\end{array}\right]$