JuliaLang/julia — pull request #5828 by tkelman (2014-02-16 01:46:32+00:00)
Title: Sparse blkdiag

I can't live without blkdiag on sparse matrices. This is almost identical to the hcat implementation, except for offsetting the row indices. There's probably a better way to share the common code? And I imagine this kind of thing should be tested, documented, etc.