adding missing function linsolve for Octave (inefficient and minimal implementation

for current needs)

matlab/dynare_config.m

@@ -93,6 +93,11 @@ if (exist('OCTAVE_VERSION') && ~user_has_octave_forge_package('statistics')) ...
     addpath([dynareroot '/missing/nanmean'])
 end
 
+% linsolve is missing in Octave
+if (exist('OCTAVE_VERSION'))
+    addpath([dynareroot '/missing/linsolve'])
+end
+
 % Add path to MEX files
 if exist('OCTAVE_VERSION')
     addpath([dynareroot '../mex/octave/']);

matlab/missing/linsolve/linsolve.m

+function [x,c] = linsolve(A,B,opts)
+% (very imperfect) Clone of Matlab's linsolve.
+
+% Copyright (C) 2010-2011 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare 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.
+%
+% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+    c = [];
+    x = [];
+    if nargin == 3
+        if isfield(opts,'TRANSA')
+            A = A';
+        end
+    end
+    if nargout == 2
+        c = rcond(A);
+    end
+    
+    x = A\B;
+