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diff --git a/modules/cacsd/macros/solve.sci b/modules/cacsd/macros/solve.sci
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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) INRIA - F. Delebecque , Serge STEER
+//
+// 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 x=solve(a,b)
+    // x=solve(A,b) solves A*x = b when A is an upper triagular matrix
+    // made of character strings.
+    //!
+
+    [na,ma]=size(a),[mb,nb]=size(b)
+    pivot=a(na,na);
+    if pivot<>"1" then
+        for k=1:nb,
+            x(1,k)=ldivf(pivot,b(na,k))
+        end
+    else
+        x=b(na,:)
+    end
+    // update
+    if na>1 then
+        for l=1:na-1,
+            pivot=mulf("-1",a(l,na))
+            for k=1:nb,
+                b(l,k)=addf(b(l,k),mulf(pivot,x(k)))
+            end
+        end
+        y=solve(a(1:na-1,1:na-1),b(1:na-1,:))
+        x=[y;x]
+    end
+endfunction