[SciPy-user] Trace of a sparse matrix ?

Arnd Baecker arnd.baecker at web.de
Thu Feb 16 10:12:28 CST 2006

On Thu, 16 Feb 2006, Nils Wagner wrote:

> Hi all,
> Is it possible to compute the trace of a sparse matrix say A
> without detouring
> spur=trace(A.todense()) ?

what about summing up all diagonal elements which exist in A?


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