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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
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