Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / __adjust_frd_data__.m

diff --git a/octave_packages/control-2.3.52/__adjust_frd_data__.m b/octave_packages/control-2.3.52/__adjust_frd_data__.m
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+## Copyright (C) 2010   Lukas F. Reichlin
+##
+## This file is part of LTI Syncope.
+##
+## LTI Syncope 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 3 of the License, or
+## (at your option) any later version.
+##
+## LTI Syncope 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 LTI Syncope.  If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## Common code for adjusting FRD model data.
+## Used by @frd/frd.m and @frd/__set__.m
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2010
+## Version: 0.1
+
+function [H, w] = __adjust_frd_data__ (H, w);
+
+  w = reshape (w, [], 1);
+  lw = length (w);
+
+  if (ndims (H) != 3 && ! isempty (H))
+    if (isscalar (H))
+      H = reshape (H, 1, 1, []);
+      if (lw > 1)
+        H = repmat (H, [1, 1, lw]);            # needed for "frd1 + scalar2" or "scalar1 * frd2) 
+      endif
+    elseif (isvector (H) && length (H) == lw)  # SISO system (H is a vector)
+      H = reshape (H, 1, 1, []);
+    elseif (ismatrix (H))
+      H = reshape (H, rows (H), []);
+      if (lw > 1)
+        H = repmat (H, [1, 1, lw]);            # needed for "frd1 + matrix2" or "matrix1 * frd2) 
+      endif
+    else
+      error ("frd: first argument H invalid");
+    endif
+  elseif (isempty (H))
+    H = zeros (0, 0, 0);
+  endif
+
+endfunction
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