Hi, thank you for reply. For example, X2- can take only 4 different values (30, ?, ?, 100). I need to find ? and ? such that sum of Z remains unchanged, but which is function of y1 (which is function of several variables ) For example, y1= F(x1, x2, x3). And Z= F(y1, y2, y3). initial values of X2 were 50 and 100 only. I now to use (30, ?, ?, 100) . need to go from (50,50, 100, 100) to (30, ?, ? , 100) such that total Z remains the same as before ( can think of that as just simple constraint). hope that would be more clear. X1 X2 X3 3 30 45 4 ? 56 6 ? 54 7 100 54 10 ? 50 3 30 45
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