octave-nkf: scripts/general/nextpow2.m annotate

annotate scripts/general/nextpow2.m @ 15144:9cc337ced51a

build: Update OCTAVE_UMFPACK_SEPARATE_SPLIT macro to look for SuiteSparse header file. * acinclude.m4: Update OCTAVE_UMFPACK_SEPARATE_SPLIT macro to look for SuiteSparse header file.

author	Rik <rik@octave.org>
date	Fri, 10 Aug 2012 12:56:15 -0700
parents	f3d52523cde1
children	d63878346099

rev	line source
14138 72c96de7a403 maint: update copyright notices for 2012 John W. Eaton <jwe@octave.org> parents: 12795 diff changeset	1 ## Copyright (C) 1995-2012 Kurt Hornik
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	2 ##
3922 38c61cbf086c [project @ 2002-05-01 06:48:35 by jwe] jwe parents: 3426 diff changeset	3 ## This file is part of Octave.
38c61cbf086c [project @ 2002-05-01 06:48:35 by jwe] jwe parents: 3426 diff changeset	4 ##
38c61cbf086c [project @ 2002-05-01 06:48:35 by jwe] jwe parents: 3426 diff changeset	5 ## Octave is free software; you can redistribute it and/or modify it
38c61cbf086c [project @ 2002-05-01 06:48:35 by jwe] jwe parents: 3426 diff changeset	6 ## under the terms of the GNU General Public License as published by
7016 93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 6046 diff changeset	7 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 6046 diff changeset	8 ## your option) any later version.
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	9 ##
3922 38c61cbf086c [project @ 2002-05-01 06:48:35 by jwe] jwe parents: 3426 diff changeset	10 ## Octave is distributed in the hope that it will be useful, but
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	13 ## General Public License for more details.
f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	14 ##
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	15 ## 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: 6046 diff changeset	16 ## along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 6046 diff changeset	17 ## <http://www.gnu.org/licenses/>.
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	18
3321 6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	19 ## -- texinfo --
6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	20 ## @deftypefn {Function File} {} nextpow2 (@var{x})
9141 c1fff751b5a8 Update section 17.1 (Utility Functions) of arith.txi Rik <rdrider0-list@yahoo.com> parents: 8920 diff changeset	21 ## If @var{x} is a scalar, return the first integer @var{n} such that
3321 6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	22 ## @tex
9167 1231b1762a9a Simplify TeXinfo and eliminate use of @iftex in arith.txi Rik <rdrider0-list@yahoo.com> parents: 9141 diff changeset	23 ## $2^n \ge \|x\|$.
3321 6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	24 ## @end tex
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 7017 diff changeset	25 ## @ifnottex
10793 be55736a0783 Grammarcheck the documentation from m-files. Rik <octave@nomad.inbox5.com> parents: 9167 diff changeset	26 ## 2^n @geq{} abs (x).
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 7017 diff changeset	27 ## @end ifnottex
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	28 ##
3321 6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	29 ## If @var{x} is a vector, return @code{nextpow2 (length (@var{x}))}.
9141 c1fff751b5a8 Update section 17.1 (Utility Functions) of arith.txi Rik <rdrider0-list@yahoo.com> parents: 8920 diff changeset	30 ## @seealso{pow2, log2}
3321 6923abb04e16 [project @ 1999-10-26 18:15:30 by jwe] jwe parents: 2816 diff changeset	31 ## @end deftypefn
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	32
5428 2a16423e4aa0 [project @ 2005-08-23 18:38:27 by jwe] jwe parents: 5307 diff changeset	33 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	34 ## Created: 7 October 1994
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	35 ## Adapted-By: jwe
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	36
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	37 function n = nextpow2 (x)
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	38
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	39 if (nargin != 1)
6046 34f96dd5441b [project @ 2006-10-10 16:10:25 by jwe] jwe parents: 5642 diff changeset	40 print_usage ();
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	41 endif
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	42
4030 22bd65326ec1 [project @ 2002-08-09 18:58:13 by jwe] jwe parents: 3922 diff changeset	43 if (! (isscalar (x) \|\| isvector (x)))
11472 1740012184f9 Use uppercase for variable names in error() strings to match Info documentation. Only m-files done. Rik <octave@nomad.inbox5.com> parents: 10793 diff changeset	44 error ("nextpow2: X must be a scalar or a vector");
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	45 endif
2816 ad4bf2a82b4f [project @ 1997-03-15 21:08:25 by jwe] jwe parents: 2539 diff changeset	46
ad4bf2a82b4f [project @ 1997-03-15 21:08:25 by jwe] jwe parents: 2539 diff changeset	47 t = length (x);
ad4bf2a82b4f [project @ 1997-03-15 21:08:25 by jwe] jwe parents: 2539 diff changeset	48 if (t > 1)
ad4bf2a82b4f [project @ 1997-03-15 21:08:25 by jwe] jwe parents: 2539 diff changeset	49 x = t;
ad4bf2a82b4f [project @ 1997-03-15 21:08:25 by jwe] jwe parents: 2539 diff changeset	50 endif
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	51
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	52 [f, n] = log2 (abs (x));
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	53 if (f == 0.5)
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	54 n = n - 1;
1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	55 endif
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3407 diff changeset	56
2539 1dca28c213f0 [project @ 1996-11-19 23:54:48 by jwe] jwe parents: diff changeset	57 endfunction
12795 9e7ebbaf69ff codesprint: new tests for files in scripts/general directory John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	58
9e7ebbaf69ff codesprint: new tests for files in scripts/general directory John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	59
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	60 %!assert (nextpow2 (16), 4)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	61 %!assert (nextpow2 (17), 5)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	62 %!assert (nextpow2 (31), 5)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	63 %!assert (nextpow2 (-16), 4)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	64 %!assert (nextpow2 (-17), 5)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	65 %!assert (nextpow2 (-31), 5)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	66 %!assert (nextpow2 (1:17), 5)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	67
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	68 %!error nexpow2 ()
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	69 %!error nexpow2 (1, 2)
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	70

Mercurial > hg > octave-nkf

annotate scripts/general/nextpow2.m @ 15144:9cc337ced51a