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Question

I want to add constraints like

0.2(x1+x2+y1+y2+900)>=1;

in LpSolve but i've got Parse error. i've tried to like but still got error:

0.2*(x1+x2+y1+y2+900)>=1;

How should I specify for .lp format? Thank you.

Answer

You can use:

0.2*x1 + 0.2*x2 + 0.2*y1 + 0.2*y2 + 180 >=1;

And it should work. (That is, perform the distributive multiplication manually.) A modeling language like JuMP or CVXPY would handle this automatically.