Mercurial > octave
annotate libinterp/corefcn/rcond.cc @ 21317:a4faec57f4c8
maint: remove semicolon after %!assert tests to follow Octave conventions.
* testfun.txi: Remove semicolons from examples in manual and update remaider
of text to reflect changes.
* bsxfun.cc, cellfun.cc, data.cc, hash.cc, lu.cc, nproc.cc,
rcond.cc, regexp.cc, sparse-xpow.cc, strfns.cc, symtab.cc, time.cc,
variables.cc, ov-class.cc, ov-cx-diag.cc, ov-struct.cc, ov.cc, oct-parse.in.yy,
pt-mat.cc, CMatrix.cc, oct-inttypes.cc, md5sum.m, blkdiag.m, cell2mat.m,
interp1.m, interp2.m, interpft.m, num2str.m, repmat.m, ntsc2rgb.m, expm.m,
inputname.m, polyvalm.m, blackman.m, hamming.m, hanning.m, eigs.m, median.m,
binopdf.m, strsplit.m, strtok.m, assert.m, example.m, datevec.m, bug-38565.tst,
build-sparse-tests.sh, classdef.tst, classes.tst, diag-perm.tst, index.tst,
io.tst, logical-index.tst, nest.tst, parser.tst, prefer.tst, struct.tst:
maint: remove semicolon after %!assert tests to follow Octave conventions.
| author | Rik <rik@octave.org> |
|---|---|
| date | Sun, 21 Feb 2016 08:10:36 -0800 |
| parents | 40de9f8f23a6 |
| children | aba2e6293dd8 |
| rev | line source |
|---|---|
| 7788 | 1 /* |
| 2 | |
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3 Copyright (C) 2008-2015 David Bateman |
| 7788 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with Octave; see the file COPYING. If not, see | |
| 19 <http://www.gnu.org/licenses/>. | |
| 20 | |
| 21 */ | |
| 22 | |
| 23 #ifdef HAVE_CONFIG_H | |
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24 # include "config.h" |
| 7788 | 25 #endif |
| 26 | |
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27 #include "defun.h" |
| 7788 | 28 #include "error.h" |
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29 #include "errwarn.h" |
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30 #include "ovl.h" |
| 7788 | 31 #include "utils.h" |
| 32 | |
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33 DEFUN (rcond, args, , |
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34 "-*- texinfo -*-\n\ |
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35 @deftypefn {} {@var{c} =} rcond (@var{A})\n\ |
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36 Compute the 1-norm estimate of the reciprocal condition number as returned\n\ |
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37 by @sc{lapack}.\n\ |
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38 \n\ |
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39 If the matrix is well-conditioned then @var{c} will be near 1 and if the\n\ |
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40 matrix is poorly conditioned it will be close to 0.\n\ |
| 7788 | 41 \n\ |
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42 The matrix @var{A} must not be sparse. If the matrix is sparse then\n\ |
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43 @code{condest (@var{A})} or @code{rcond (full (@var{A}))} should be used\n\ |
| 7788 | 44 instead.\n\ |
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45 @seealso{cond, condest}\n\ |
| 7788 | 46 @end deftypefn") |
| 47 { | |
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48 if (args.length () != 1) |
| 7788 | 49 print_usage (); |
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50 |
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51 octave_value retval; |
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52 |
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53 if (args(0).is_sparse_type ()) |
| 7788 | 54 error ("rcond: for sparse matrices use 'rcond (full (a))' or 'condest (a)' instead"); |
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55 |
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56 if (args(0).is_single_type ()) |
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57 { |
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58 if (args(0).is_complex_type ()) |
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59 { |
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60 FloatComplexMatrix m = args(0).float_complex_matrix_value (); |
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61 MatrixType mattyp; |
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62 retval = m.rcond (mattyp); |
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63 args(0).matrix_type (mattyp); |
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64 } |
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65 else |
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66 { |
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67 FloatMatrix m = args(0).float_matrix_value (); |
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68 MatrixType mattyp; |
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69 retval = m.rcond (mattyp); |
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70 args(0).matrix_type (mattyp); |
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71 } |
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72 } |
| 7788 | 73 else if (args(0).is_complex_type ()) |
| 74 { | |
| 75 ComplexMatrix m = args(0).complex_matrix_value (); | |
| 76 MatrixType mattyp; | |
| 77 retval = m.rcond (mattyp); | |
| 78 args(0).matrix_type (mattyp); | |
| 79 } | |
| 80 else | |
| 81 { | |
| 82 Matrix m = args(0).matrix_value (); | |
| 83 MatrixType mattyp; | |
| 84 retval = m.rcond (mattyp); | |
| 85 args(0).matrix_type (mattyp); | |
| 86 } | |
| 87 | |
| 88 return retval; | |
| 89 } | |
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90 |
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91 /* |
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92 %!assert (rcond (eye (2)), 1) |
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93 %!assert (rcond (ones (2)), 0) |
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94 %!assert (rcond ([1 1; 2 1]), 1/9) |
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95 %!assert (rcond (magic (4)), 0, eps) |
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96 |
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97 %!shared x, sx |
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98 %! x = [-5.25, -2.25; -2.25, 1] * eps () + ones (2) / 2; |
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99 %! sx = [-5.25, -2.25; -2.25, 1] * eps ("single") + ones (2) / 2; |
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100 %!assert (rcond (x) < eps ()) |
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101 %!assert (rcond (sx) < eps ('single')) |
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102 %!assert (rcond (x*i) < eps ()) |
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103 %!assert (rcond (sx*i) < eps ('single')) |
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104 |
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105 */ |