Is there a more compact notation for representing a block-diagonal matrix than
$\left[\begin{array}{cccc} \mathbf{W}_1 & 0 & ... & 0\\ 0 & \mathbf{W}_2 & ... & 0\\ 0 & 0 & \ddots & 0\\ 0 & 0 & ... & \mathbf{W}_n \end{array}\right] $
Something as simple as replacing
$\left[\begin{array}{c} \mathbf{m}_1\\ \mathbf{m}_2\\ \vdots\\ \mathbf{m}_n \end{array}\right] $
with
$\left[\mathbf{m}_1^T~\mathbf{m}_2^T~...~\mathbf{m}_n^T\right]^T$
for vectors? I'm just trying to reduce the space required for a manuscript. Is
$ diag\left\{\mathbf{W}_1~ \mathbf{W}_2~...~\mathbf{W}_n \right\} $
acceptable notation?