[SciPy-user] Easy way to make a block diagonal matrix?

Joshua Stults joshua.stults@gmail....
Wed May 20 17:47:07 CDT 2009

Well that's a good point; I didn't even notice he wanted three
different matrices, I just latched on to 'block diagonal'; I guess
I've only ever used kron type functions for doing block matrices with
the same matrix at each block entry:


Like you'd get with a multi-dimensional finite difference
discretization.  Just curious, what sort of application would give you
different matrix blocks on the diagonal?

2009/5/20 Stéfan van der Walt <stefan@sun.ac.za>:
> 2009/5/20 Joshua Stults <joshua.stults@gmail.com>:
>> Probably numpy.kron() already provides this functionality plus easily
>> generating more general block matrices:
>> http://docs.scipy.org/doc/numpy/reference/generated/numpy.kron.html
> numpy.kron takes two arrays as input, so I'm not sure how that could
> work, especially for diagonal blocks with varying shapes?  Would you
> use object arrays? Could be that my brain has gone to bed already!
> Regards
> Stéfan
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Joshua Stults
Website: http://j-stults.blogspot.com

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