# source:trunk/projects/slim-curve/src/main/c/GCI_Lsqnonneg.h@7781

Revision 7781, 2.4 KB checked in by paulbarber, 8 years ago (diff)

Added GPL license to all source code.

Line
1/*
2This file is part of the SLIM-curve package for exponential curve fitting of spectral lifetime data.
3
4Copyright (c) 2010, 2011, Gray Institute University of Oxford & UW-Madison LOCI.
5
6    This program is free software: you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation, either version 3 of the License, or
9    (at your option) any later version.
10
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15
16    You should have received a copy of the GNU General Public License
17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19
20/* Header file for functions defined in lsqnonneg.c */
21
22/**********************************************************************
23   Function GCI_lsqnonneg
24
25   This function solves the non-negative least squares problem:
26   minimise |Ax-b| subject to x >= 0 (where |v| is the 2-norm of the
27   vector v).
28
29   Arguments: A, an m x n matrix, in the form double A[n][m], so
30                 the columns of A are A[0], A[1], ..., A[n-1]
31              b, the m-vector
32
33              !!! NB: A and B will both be modified unless preserve is
34              !!!     non-zero (see below).
35
36              x, the solution will be placed here
37              m ) the dimensions of A
38              n )
39              preserve, copy A and b before solving the problem
40              rnorm, (double *) the value of |Ax-b| with the
41                determined x if the function was successful or if the
42                iteration count was exceeded.  This can be NULL.
43              lambda, an n-vector which will contain the dual vector
44                 on completion (that is, the Lagrange multipliers).
45                 This can be NULL.
46
47   On exit:
48              The return value will be 0 on success, and negative if
49                a problem occurred:
50                -1: m > MAX_EQNS or m <= 0
51                -2: n > MAX_VARS or n <= 0
52                -3: iteration count exceeded: more than 3*n iterations
53                    performed
54                -4: memory allocation problems
55
56**********************************************************************/
57
58int GCI_lsqnonneg(double **A, double *b, double *x, int m, int n,
59                  int preserve, double *rnorm, double *lambda);
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