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Please note that the recommended version of Scilab is 5.3.3. This page might be outdated.
See the recommended documentation of this function

[x [,sexp]] = trisolve(A,b [,sexp])

A=['x','y';'0','z'];b=['0';'1'];
w=trisolve(A,b)
x=5;y=2;z=4;
evstr(w)
inv(evstr(A))*evstr(b)