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Re: Sparse functions for octave
From: 
John W. Eaton 
Subject: 
Re: Sparse functions for octave 
Date: 
Tue, 16 Nov 1999 22:18:10 0600 (CST) 
On 16Nov1999, A+A Adler <address@hidden> wrote:
 On Mon, 15 Nov 1999, John W. Eaton wrote:
 > Here's an example for the integer class defined in make_int.cc:
 > octave_value_list
 > octave_integer::do_index_op (int, const octave_value_list& idx)

 Great, thanks. I've now got indexing working on sparse variables.
OK. BTW, you *can* use the other function signature if you also
define an is_constant() function in your class that returns true.
 However in order to implement an efficient indexing algorithm,
 I need to sort the idx_vector, and then use the sort index
 to build the extracted matrix.

 After digging around in /usr/local/include/octave/idxvector.h,
 I found several methods on idx_vector which look promising.

 I can use idx_vector::sort, but I need to get the sort index
 as well.

 Could you explain if any of the methods on idx_vector allow
 this?
I don't think so. It's not something that has come up before. You'll
need to add a new method to the idx_vector class (and its internal
idx_vector_rep class) that do what you want.
jwe

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 Re: Sparse functions for octave, A+A Adler, 1999/11/13
 Re: Sparse functions for octave, John W. Eaton, 1999/11/13
 Re: Sparse functions for octave, A+A Adler, 1999/11/15
 Re: Sparse functions for octave, John W. Eaton, 1999/11/15
 Re: Sparse functions for octave, A+A Adler, 1999/11/16
 Re: Sparse functions for octave,
John W. Eaton <=
 Re: Sparse functions for octave, A+A Adler, 1999/11/26
 Re: Sparse functions for octave, Mike Miller, 1999/11/27
 Re: Sparse functions for octave, John W. Eaton, 1999/11/28