1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) XXXX-2008 - INRIA
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
function [lp,ln,v]=sp2adj(A)
// A = n x m sparse matrix
// lp, ln, v = adjacency representation of A i.e:
// lp(j+1)-lp(j) = # of non zero entries in row j
// ln = column index of the non zeros entries
// in row 1, row 2,..., row n.
// v = values of non zero entries
// in row 1, row 2,..., row n.
// lp is a (column) vector of size n+1
// ln is an integer (column) vector of size nnz(A).
// v is a real vector of size nnz(A).
[ij,v,n]=spget(A');
N=n(1);
if ij == [] then,
lp=ones(n(2)+1,1);ln=[];v=[];
else,
[lp,la,ln]=ta2lpd(ij(:,1)',ij(:,2)',N+1,N)
lp=lp(:);ln=ln(:);
end;
endfunction
|
