pointwise operations on scipy.sparse matrices

Question

Is it possible to apply for example numpy.exp or similar pointwise operators to all elements in a scipy.sparse.lil_matrix or another sparse matrix format?

import numpy
from scipy.sparse import lil_matrix

x = numpy.ones((10,10))
y = numpy.exp(x)

x = lil_matrix(numpy.ones((10,10)))
# y = ????

numpy.exp(x) or scipy.exp(x) yields an AttributeError, and numpy.exp(x.data) yields the same.

thanks!

Answer 1

I do not know the full details, but converting to another type works, at least when using the array of non zero elements:

xcsc = x.tocsc()
numpy.exp(xcsc.data) # works