The type(expr, `.`) function checks for expressions that use `.` as a (non-commutative) multiplication operator. For more information about the `.` operator, see dot.

type/function

$\mathrm{type}\left(3.2\,\mathrm{`.`}\right)$

$\mathrm{false}$

$\mathrm{type}\left(3·x\,\mathrm{`.`}\right)$

$\mathrm{false}$

$\mathrm{type}\left(a·b\,\mathrm{`.`}\right)$

$\mathrm{true}$

$V≔\mathrm{Vector}\left[\mathrm{row}\right]\left(\left[2\,2\right]\right)$

$V≔\left[\begin{array}{cc}2& 2\end{array}\right]$

$M≔\mathrm{Matrix}\left(\left[\left[1\,2\right]\,\left[3\,4\right]\right]\right)$

$M≔\left[\begin{array}{cc}1& 2\\ 3& 4\end{array}\right]$

$\mathrm{type}\left(V·M\,\mathrm{`.`}\right)$

$\mathrm{false}$

$\mathrm{type}\left(\mathrm{\lambda }·M\,\mathrm{`.`}\right)$

$\mathrm{true}$