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Re: About diagonal matrices
From: |
John W. Eaton |
Subject: |
Re: About diagonal matrices |
Date: |
Sat, 21 Feb 2009 16:46:35 -0500 |
On 21-Feb-2009, Jaroslav Hajek wrote:
| Mathematically, there's no such thing as a NaN.
Substitute "numerically" for "mathematically" then, where
"numerically" means according to accepted conventions of the IEEE
standard for floating point arithmetic.
| In my opinion, the current behaviour is the most useful and sane and
| is OK if it's documented.
| If you intend to work on "fixing" these "issues", the please make the
| "mathematically wrong" behavior optional by a configuration variable,
| because I will most definitely want it to be set.
Yes, I understand that it is convenient for many uses for diagonal
and sparse matrices to have the properties you want. But I'm also
don't like having things like
full_matrix == diag_matrix
yet
diag_matrix * scalar != full_matrix * scalar
for some values of scalar.
jwe
- Re: About diagonal matrices, John W. Eaton, 2009/02/20
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/20
- Re: About diagonal matrices, John W. Eaton, 2009/02/20
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/20
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/20
- Re: About diagonal matrices, dbateman, 2009/02/20
- Re: About diagonal matrices, Daniel J Sebald, 2009/02/21
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/21
- Re: About diagonal matrices,
John W. Eaton <=
- Re: About diagonal matrices, Søren Hauberg, 2009/02/21
- Re: About diagonal matrices, Daniel J Sebald, 2009/02/21
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22
- Re: About diagonal matrices, Søren Hauberg, 2009/02/22
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22
- Re: About diagonal matrices, John W. Eaton, 2009/02/22
- Re: About diagonal matrices, Jaroslav Hajek, 2009/02/22