[SciPy-User] Normalizing a sparse matrix

coolhead.pranay@gmai... coolhead.pranay@gmai...
Sun Mar 20 02:06:53 CDT 2011


Hi,

I have a sparse matrix with nearly (300*10000) entries constructed out of
14000*14000 matrix...In each iteration after performing some operations on
the sparse matrix(like multiply and dot) I have to divide each row of the
corresponding dense matrix with the sum of its elements...

Since sparse matrix format doesn't allow all the required matrix
operation(divide) I tried to convert it to a dense format and then divide by
the sum. But this raises MemoryError exception because 14000*14000 matrix
doesn't fit memory..

Can someone tell me how to normalize a sparse matrix ?
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