Question

I have a spase matrix called X. How to I get the sparse first row, second row etc…

So, I know there should be 100 rows.

How do I do this loop?

 for i in xrange(10):
          X[i] = row I want

The row I want should also be sparse format.

Thanks

Thanks

Answer 1

X[i] is the row you want. It will be in sparse form already (although it would probably help if you’ve made it a scipy.sparse.csr_matrix). Typically we iterate over the rows of a matrix without the index, as simply:

for row in X:
    do_stuff(row)

although if the index is necessary you can also write:

for i, row in enumerate(X):
    do_other_stuff(i, row)