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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...
`

Excellent!
You guys are great. Thanks.

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