Mercurial > octave

annotate src/DLD-FUNCTIONS/tsearch.cc @ 10154:40dfc0c99116

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
DLD-FUNCTIONS/*.cc: untabify
author John W. Eaton <jwe@octave.org>
date Wed, 20 Jan 2010 17:33:41 -0500
parents 2c279308f6ab
children c48b7048e720
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
1 /*
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
2
9245
16f53d29049f update copyright notices
John W. Eaton <jwe@octave.org>
parents: 9064
diff changeset
3 Copyright (C) 2002, 2007, 2009 Andreas Stahel
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
4
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
5 This file is part of Octave.
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
6
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
7 Octave is free software; you can redistribute it and/or modify it
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
8 under the terms of the GNU General Public License as published by the
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
9 Free Software Foundation; either version 3 of the License, or (at your
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
10 option) any later version.
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
11
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
12 Octave is distributed in the hope that it will be useful, but WITHOUT
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
15 for more details.
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
16
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
17 You should have received a copy of the GNU General Public License
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
18 along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
19 <http://www.gnu.org/licenses/>.
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
20
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
21 */
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
22
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
23 // Author: Andreas Stahel <Andreas.Stahel@hta-bi.bfh.ch>
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6823
diff changeset
24
9786
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
25 #ifdef HAVE_CONFIG_H
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
26 #include <config.h>
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
27 #endif
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
28
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
29 #include <iostream>
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
30 #include <fstream>
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
31 #include <string>
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
32
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
33 #include "lo-ieee.h"
7231
2eb392d058bb [project @ 2007-11-30 18:53:29 by jwe]
jwe
parents: 7017
diff changeset
34 #include "lo-math.h"
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
35
9786
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
36 #include "defun-dld.h"
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
37 #include "error.h"
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
38 #include "oct-obj.h"
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
39 #include "parse.h"
2c279308f6ab fix includes in some src/DLD-FUNCTIONS files
John W. Eaton <jwe@octave.org>
parents: 9245
diff changeset
40
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
41 inline double max(double a, double b, double c)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
42 {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
43 if (a < b)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
44 return ( b < c ? c : b );
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
45 else
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
46 return ( a < c ? c : a );
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
47 }
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
48
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
49 inline double min(double a, double b, double c)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
50 {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
51 if (a > b)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
52 return ( b > c ? c : b );
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
53 else
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
54 return ( a > c ? c : a );
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
55 }
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
56
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
57 #define REF(x,k,i) x(static_cast<octave_idx_type>(elem((k), (i))) - 1)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
58
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
59 // for large data set the algorithm is very slow
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
60 // one should presort (how?) either the elements of the points of evaluation
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
61 // to cut down the time needed to decide which triangle contains the
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
62 // given point
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
63
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
64 // e.g., build up a neighbouring triangle structure and use a simplex-like
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
65 // method to traverse it
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
66
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
67 DEFUN_DLD (tsearch, args, ,
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
68 "-*- texinfo -*-\n\
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
69 @deftypefn {Loadable Function} {@var{idx} =} tsearch (@var{x}, @var{y}, @var{t}, @var{xi}, @var{yi})\n\
9064
7c02ec148a3c Check grammar on all .cc files
Rik <rdrider0-list@yahoo.com>
parents: 7231
diff changeset
70 Searches for the enclosing Delaunay convex hull. For @code{@var{t} =\n\
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
71 delaunay (@var{x}, @var{y})}, finds the index in @var{t} containing the\n\
9064
7c02ec148a3c Check grammar on all .cc files
Rik <rdrider0-list@yahoo.com>
parents: 7231
diff changeset
72 points @code{(@var{xi}, @var{yi})}. For points outside the convex hull,\n\
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
73 @var{idx} is NaN.\n\
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
74 @seealso{delaunay, delaunayn}\n\
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
75 @end deftypefn")
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
76 {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
77 const double eps=1.0e-12;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
78
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
79 octave_value_list retval;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
80 const int nargin = args.length ();
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
81 if ( nargin != 5 ) {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
82 print_usage ();
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
83 return retval;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
84 }
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
85
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
86 const ColumnVector x(args(0).vector_value());
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
87 const ColumnVector y(args(1).vector_value());
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
88 const Matrix elem(args(2).matrix_value());
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
89 const ColumnVector xi(args(3).vector_value());
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
90 const ColumnVector yi(args(4).vector_value());
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
91
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
92 if (error_state) return retval;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
93
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
94 const octave_idx_type nelem = elem.rows();
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
95
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
96 ColumnVector minx(nelem);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
97 ColumnVector maxx(nelem);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
98 ColumnVector miny(nelem);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
99 ColumnVector maxy(nelem);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
100 for(octave_idx_type k = 0; k < nelem; k++)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
101 {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
102 minx(k) = min(REF(x,k,0), REF(x,k,1), REF(x,k,2)) - eps;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
103 maxx(k) = max(REF(x,k,0), REF(x,k,1), REF(x,k,2)) + eps;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
104 miny(k) = min(REF(y,k,0), REF(y,k,1), REF(y,k,2)) - eps;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
105 maxy(k) = max(REF(y,k,0), REF(y,k,1), REF(y,k,2)) + eps;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
106 }
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
107
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
108 const octave_idx_type np = xi.length();
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
109 ColumnVector values(np);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
110
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
111 double x0 = 0.0, y0 = 0.0;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
112 double a11 = 0.0, a12 = 0.0, a21 = 0.0, a22 = 0.0, det = 0.0;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
113
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
114 octave_idx_type k = nelem; // k is a counter of elements
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
115 for(octave_idx_type kp = 0; kp < np; kp++)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
116 {
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
117 const double xt = xi(kp);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
118 const double yt = yi(kp);
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
119
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
120 // check if last triangle contains the next point
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
121 if (k < nelem)
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
122 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
123 const double dx1 = xt - x0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
124 const double dx2 = yt - y0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
125 const double c1 = (a22 * dx1 - a21 * dx2) / det;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
126 const double c2 = (-a12 * dx1 + a11 * dx2) / det;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
127 if ( c1 >= -eps && c2 >= -eps && (c1 + c2) <= (1 + eps))
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
128 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
129 values(kp) = double(k+1);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
130 continue;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
131 }
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
132 }
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
133
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
134 // it doesn't, so go through all elements
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
135 for (k = 0; k < nelem; k++)
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
136 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
137 OCTAVE_QUIT;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
138 if (xt >= minx(k) && xt <= maxx(k) &&
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
139 yt >= miny(k) && yt <= maxy(k) )
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
140 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
141 // element inside the minimum rectangle: examine it closely
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
142 x0 = REF(x,k,0);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
143 y0 = REF(y,k,0);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
144 a11 = REF(x,k,1)-x0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
145 a12 = REF(y,k,1)-y0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
146 a21 = REF(x,k,2)-x0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
147 a22 = REF(y,k,2)-y0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
148 det = a11 * a22 - a21 * a12;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
149
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
150 // solve the system
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
151 const double dx1 = xt - x0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
152 const double dx2 = yt - y0;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
153 const double c1 = (a22 * dx1 - a21 * dx2) / det;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
154 const double c2 = (-a12 * dx1 + a11 * dx2) / det;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
155 if ((c1 >= -eps) && (c2 >= -eps) && ((c1 + c2) <= (1 + eps)))
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
156 {
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
157 values(kp) = double(k+1);
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
158 break;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
159 }
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
160 } //endif # examine this element closely
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
161 } //endfor # each element
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
162
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
163 if (k == nelem)
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 9786
diff changeset
164 values(kp) = lo_ieee_nan_value ();
6823
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
165
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
166 } //endfor # kp
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
167
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
168 retval(0) = values;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
169
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
170 return retval;
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
171 }
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
172
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
173 /*
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
174 %!shared x, y, tri
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
175 %! x = [-1;-1;1];
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
176 %! y = [-1;1;-1];
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
177 %! tri = [1, 2, 3];
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
178 %!error (tsearch())
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
179 %!assert (tsearch (x,y,tri,-1,-1), 1)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
180 %!assert (tsearch (x,y,tri, 1,-1), 1)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
181 %!assert (tsearch (x,y,tri,-1, 1), 1)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
182 %!assert (tsearch (x,y,tri,-1/3, -1/3), 1)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
183 %!assert (tsearch (x,y,tri, 1, 1), NaN)
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
184
9fddcc586065 [project @ 2007-08-24 08:27:27 by dbateman]
dbateman
parents:
diff changeset
185 */