Error when trying to create matrix of matrices with NumPy

Asked Feb 06 '18 at 20:29

Active Feb 06 '18 at 20:39

Viewed 28 times

So, I have 3 matrices let's say a,b,c, which have the following shapes:

a: (6, 6)
b: (9, 9) 
c: (6, 9)

I want to create the following matrix:

d = np.matrix([[a, c], [c.T, b]])

But I get the following error and I cannot find the solution:

ValueError: setting an array element with a sequence.

I am out of ideas and cannot find anything similar on Google.

asked Feb 06 '18 at 20:29

Nikos

are these submatrices? – Willem Van Onsem Feb 06 '18 at 20:31
Yes, these are 3 independent matrices. – Nikos Feb 06 '18 at 20:41
`np.matrix([[a,c],[c.T, b]],dtype=object)` works - if that's what you want. So does `np.block([[a,c],[c.T, b]])`, but makes something quite different. And `bmat`. – hpaulj Feb 06 '18 at 21:47
More on how `numpy` concatenation compares with MATLAB, https://stackoverflow.com/questions/48604370/concatenate-matrices-vectors-in-python-like-in-matlab – hpaulj Feb 06 '18 at 22:54

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