1 files changed, 43 insertions, 0 deletions
diff --git a/modules/cacsd/macros/unobs.sci b/modules/cacsd/macros/unobs.sci
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+++ b/modules/cacsd/macros/unobs.sci
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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) INRIA -
+// Copyright (C) 2012 - Scilab Enterprises - Cedric Delamarrre
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
+
+function [dim,x]=unobs(A,C,tol)
+    // n first columns of x span the unobservable
+    // subspace of (A,C):
+    //          dim
+    //          [*,*]
+    // X'*A*X = [0,*]
+    //
+    //    C*X = [0,*]
+    // Copyright INRIA
+
+    [lhs,rhs]=argn(0);
+
+    if rhs < 2
+        error(msprintf(gettext("%s: Wrong number of input argument: %d to %d expected."),"unobs", 2, 3));
+    end
+
+    if typeof(A) <> "constant" | ~isreal(A)
+        error(msprintf(gettext("%s: Wrong type for input argument #%d: A real matrix expected."),"unobs",1));
+    end
+
+    if typeof(C) <> "constant" | ~isreal(C)
+        error(msprintf(gettext("%s: Wrong type for input argument #%d: A real matrix expected."),"unobs",2));
+    end
+
+    if rhs == 2
+        tol=1.d-10*norm([A;C],1);
+    end
+
+    [p,p]=size(A);
+    [n,w]=contr(A',C',tol);
+    x=[w(:,n+1:p),w(:,1:n)];
+    dim=p-n;
+endfunction