Important: The linalg package has been deprecated. Use the superseding packages, LinearAlgebra and VectorCalculus, instead.

- For information on migrating linalg code to the new packages, see examples/LinearAlgebraMigration.

The call iszero(A) returns true if all of the entries of matrix A are zero, false or an error otherwise.

The command with(linalg,iszero) allows the use of the abbreviated form of this command.

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

$A≔\mathrm{array}\left(\left[\left[2\,1\right]\,\left[1\,2\right]\right]\right)$

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

$\mathrm{iszero}\left(\mathrm{subs}\left(x=A\,\mathrm{charpoly}\left(A\,x\right)\right)\right)$

$\mathrm{true}$

$A≔\mathrm{matrix}\left(3\,3\,\left[1\,0\,0\,0\,0\,0\,0\,0\,0\right]\right)$

$A≔\left[\begin{array}{ccc}1& 0& 0\\ 0& 0& 0\\ 0& 0& 0\end{array}\right]$

$\mathrm{iszero}\left(A\right)$

$\mathrm{false}$