This question already has an answer here:
I know join[...] works, but it is a bit troublesome for multiple matrices.I tried DiagonalMatrix[...], but DiagonalMatrix can only form matrix from a list of elements.
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Edit: Much more elegant form (thanks to Mr.Wizard)
|show 10 more comments|
Here is another way to do this, illustrating a forcing of
Or a bit more cleanly using
|show 4 more comments|