hi,

I wanted to know if there is a way to work in Sage with arrays of
matrices or something similar (something like a[i,j,k], so that
a[i,:,:], a[:,j,:] and a[:,:,k] are all matrices. I tried to use a
list of matrices but apparently sage interprets it as a list of
vectors:

sage: m=matrix(RR,2,range(1,5))
sage: m1=matrix(RR,2,range(6,10))
sage: lm=list(m)
sage: lm.append(m1)
sage: lm

[(1.00000000000000, 2.00000000000000),
 (3.00000000000000, 4.00000000000000),
 [6.00000000000000 7.00000000000000]
[8.00000000000000 9.00000000000000]]
sage: lm[1]
(3.00000000000000, 4.00000000000000)

I also wanted to know if there is a command to create a list (or
matrix, or vector) of equal elements;
to sum the entries of vectors, particularly of rows of matrices,

thanks in advance,

Aniura
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