Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / fixed-0.7.10 / create_lookup_table.m

diff --git a/octave_packages/fixed-0.7.10/create_lookup_table.m b/octave_packages/fixed-0.7.10/create_lookup_table.m
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+++ b/octave_packages/fixed-0.7.10/create_lookup_table.m
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+## Copyright (C) 2003  Motorola Inc
+## Copyright (C) 2003  David Bateman
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{table} =} create_lookup_table (@var{x}, @var{y})
+## Creates a lookup table betwen the vectors @var{x} and @var{y}. If @var{x}
+## is not in increasing order, the vectors are sorted before being stored.
+## @end deftypefn
+
+function table = create_lookup_table (x, y)
+  if any(size(x) != size(y))
+    error("create_lookup_table: tables must have the same dimension");
+  elseif ! isvector(x)
+    error("create_lookup_table: tables must be vectors");
+  else
+    ## This assumes that fsort is overloading sort for fixed point types
+    [table.x, idx] = sort(x);
+    table.y = y(idx);
+  endif
+endfunction