[SciPy-user] Trace of a sparse matrix ?
nwagner at mecha.uni-stuttgart.de
Thu Feb 16 10:43:08 CST 2006
Arnd Baecker wrote:
>On Thu, 16 Feb 2006, Nils Wagner wrote:
>>Is it possible to compute the trace of a sparse matrix say A
>what about summing up all diagonal elements which exist in A?
and are not equal to zero.
It would be nice to have a built-in function "sptrace(A)" for this task
within scipy :-)
The same holds for the norm of a sparse matrix
linalg.norm(A.todense()) is not optimal or even impossible if A is
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