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Re: manipulating sparse matrices

From: Mike Miller
Subject: Re: manipulating sparse matrices
Date: Sat, 15 Oct 2005 10:50:25 -0500 (CDT)

On Sat, 15 Oct 2005, David Bateman wrote:

nzmax is in 2.9, as the source-forge index was I believe based on a 2.9.2 release, it should probably be updated soon as many things have changed (eg statistics functions, etc). The 0bytes is a missing feature in the octave-forge sparse functions as the bytes size in the whos function I believe was added at 2.1.58, after the octave-forge sparse stuff was written. Basically, it needs to implement a byte_size() function to return the value that will be printed.. This also works in 2.9.3

For the meantime, stuck as I am in the 2.1.71 world (because I'm developing code for users who can install 2.1.71), can I estimate nzmax by taking 8*nnz()? It seems that full matrices use 8 bytes per element. Or maybe it should be 3*8*nnz() because every sparse element requires three terms: row, column and value.

As you were asking about cholesky factorizations previously, I've just gotten sparse cholesky factorizations working with cholmod and will commit this soon, I want to try to address the chol2inv, cholinv and inv functions, and update the docs first though...


You guys are great.  Thanks.

I suppose that Octave 2.9.x will be released someday as Octave 3.0. Is that the plan?


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