Important: The linalg package has been deprecated. Use the superseding command LinearAlgebra[DiagonalMatrix], instead.

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

The call diag(B1, B2, .., Bn) returns a matrix on whose diagonal are the matrix blocks B1, B2, .., Bn.

If used in conjunction with JordanBlock, diag can be used to easily create a Jordan form matrix.

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

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

$\mathrm{B1}≔\mathrm{array}\left(\left[\left[1\,3\,5\right]\,\left[9\,a\,z\right]\,\left[x^2\,\sin \left(q\right)\,10\right]\right]\right)$

$\mathrm{B1}≔\left[\begin{array}{ccc}1& 3& 5\\ 9& a& z\\ x^2& \sin \left(q\right)& 10\end{array}\right]$

$\mathrm{B2}≔\mathrm{matrix}\left(2\,2\,\left[1\,3\,2\,4\right]\right)$

$\mathrm{B2}≔\left[\begin{array}{cc}1& 3\\ 2& 4\end{array}\right]$

$\mathrm{diag}\left(\mathrm{B1}\,\mathrm{B2}\right)$

$\left[\begin{array}{ccccc}1& 3& 5& 0& 0\\ 9& a& z& 0& 0\\ x^2& \sin \left(q\right)& 10& 0& 0\\ 0& 0& 0& 1& 3\\ 0& 0& 0& 2& 4\end{array}\right]$

$\mathrm{diag}\left(\mathrm{\λ1}\,\mathrm{\λ2}\right)$

$\left[\begin{array}{cc}\mathrm{\λ1}& 0\\ 0& \mathrm{\λ2}\end{array}\right]$