qr2.m was missing !

git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1158 ac1d8469-bf42-47a9-8791-bf33cf982152

matlab/qr2.m

+function [Q,R] = qr2(X)
+% stephane.adjemian@ens.fr [12-07-2005]
+%
+% This routine performs a qr decomposition of matrix X such that the 
+% diagonal scalars of the upper-triangular matrix R are positive.
+[Q,R] = qr(X);
+indx = find(diag(R)<0);
+if ~isempty(indx)
+    Q(:,indx) = -Q(:,indx);
+    R(indx,:) = -R(indx,:);
+end
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