sparse array support

[smarkesini]

Hello again,
this is a feature request: It would be awesome to get some kind of sparse array support, most importantly spmv and spmm with a dense matrix, I realize this is a scipy function, but such basic linear algebra functionality would be nice, something along the lines of
S=csr_matrix((data, (row_ind, col_ind)), [shape=(M, N)])
vol=qtS #SpMV
where qt is a 1d vector or dense matrix with dimension (,M)

Cheers,
Stefano

[FilipeMaia]

This is more complicated but I'll see what can be done.

[FilipeMaia]

a84760a add very very basic sparse matrix functionality. It can do something like the following:

import afnumpy.sparse as afsparse
import numpy as np
row = np.array([0, 0, 1, 2, 2, 2])
col = np.array([0, 2, 2, 0, 1, 2])
data = np.array([1, 2, 3, 4, 5, 6], dtype=np.float32)
A = afsparse.csr_matrix((data, (row, col)), shape=(3, 3))
v = np.ones((3),dtype=np.float32)
print(A*v)

Out[]: array([ 3.,  3., 15.], dtype=float32)

[smarkesini]

Awesome, thank you!