frac(x) is the fractional part of x, that is, frac(x) = x - fix(x).

The frac(M) function computes the element-wise fractional part of M.  The result, R, is formed as R[i,j] = frac(M[i,j]).

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

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

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

$\left[\begin{array}{ccc}\mathrm{-0.6}& \mathrm{-0.6}& \mathrm{-0.6}\\ \mathrm{-0.6}& \mathrm{-0.6}& \mathrm{-0.6}\end{array}\right]$