[sage-support] Re: Creating large matrix hangs

> In the matrix constructor (matrix in sage/matrix/constructor.py):
>
> entries = sum([list(v) for v in args[0]], [])    <--- this is bad
> (quadratic in the length of argv[0] which is the number of rows here)

and to be complete, this could be replaced by:

entries = []
for v in args[0]: entries.extend(v)

Yann

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