Thanks! I think to know where the issue is :

M= random_matrix(ZZ, 10, sparse= True, density= 0.1)
M._magma_init_(magma)

'_sage_[11]![0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-14,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,8,0,0,0,0]'


This does not look like a sparse matrix to me : it's been converted to a 
"dense" matrix before magma code was produced...

no wonder if my 50,000 x 50,000 matrix takes forever to load...

If anyone has an easy fix, it would be great. Otherwise, i'll have to learn 
the syntax for sparse matrices in magma, and figure out how magma reads 
from a file...






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