/usr/share/octave/packages/image-2.2.2/tforminv.m is in octave-image 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | ## Copyright (C) 2012 Pantxo Diribarne
##
## 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 3 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{UV}] =} tforminv (@var{T}, @var{XY})
## @deftypefnx {Function File} {[@var{U}, @var{V}] =} tforminvfwd (@var{T}, @var{X}, @var{Y})
##
## Given to dimensionnal coordinates from one space, returns two
## dimensionnal coordinates in the other space, as defined in
## the transform structure @var{T}. Input and output coordinates
## may be gigen either as a n-by-2 arrays, or as two n-by-1 vectors.
## @seealso{maketform, cp2tform, tformfwd}
## @end deftypefn
## Author: Pantxo Diribarne <pantxo@dibona>
function varargout = tforminv (T, varargin)
if (nargin > 3 || nargin < 2)
print_usage ();
elseif (! istform (T))
error ("tforminv: expect a transform structure as first argument")
elseif (nargin == 2)
XX = varargin{1};
if (columns (XX) != 2)
error ("tforminv: expect n-by-2 array as second argument")
endif
else
if (!isvector (varargin{1}) || !isvector (varargin{2}))
error ("tforminv: expect vectors as coordinates")
elseif (!all (size (varargin{1}) == size (varargin{2})))
error ("tforminv: expect two vectors the same size")
elseif (columns (varargin{1}) != 1)
error ("tforminv: expect column vectors")
endif
XX = [varargin{1} varargin{2}];
endif
UU = T.inverse_fcn(XX, T);
if (nargin == 3)
varargout{1} = UU(:,1);
varargout{2} = UU(:,2);
else
varargout{1} = UU;
endif
endfunction
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