• Scilab help
• Elementary Functions
• symbolic
• solve
• trianfml
• trisolve

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[x]=solve(A,b)

A=['1','a';'0','2'];   //上三角行列
b=['x';'y'];

w=solve(A,b)

a=1;x=2;y=5;
evstr(w)
inv([1,1;0,2])*[2;5]