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From: | Daniel J Sebald |
Subject: | Re: About diagonal matrices |
Date: | Fri, 20 Feb 2009 22:45:47 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041020 |
Jaroslav Hajek wrote:
I think that what Octave does now for sparse * scalar is certainly better than what Matlab does; I'd keep it that way. Otherwise, when you do scalar * sparse, and just by coincidence scalar happens to be Inf or NaN, you fill up the memory; bang, you're dead (or your computation is).
A conversation about this came up at the "OctaConf" a few years back, one of the ideas being that a sparse matrix not necessarily have 0 as the "sparse default value". That is, the "sparse default value" could be any number, 0, NaN, Inf, 2.33, etc. I'll say more about this in a follow up to David's email... Dan
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