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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: how to plot a function subject to constraints.
Replies: 14   Last Post: Jan 7, 2013 1:15 PM

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Emrah

Posts: 8
Registered: 12/30/12
Re: how to plot a function subject to constraints.
Posted: Jan 7, 2013 11:24 AM
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Whoops. Make that
>
> infeasible=~all(G1(:)<=0) | ~all(G2(:)<=0);
>
> Also, leave x2,x3 alone. Instead, do
>
> f=1.10471.*x1^2.*x2+0.04811.*x3.*x4.*(14.0+x2);
> f(infeasible)=nan;
>
>
> > %constraints are applied to f(x)
> > f=f*mod_neg_step(g1)*mod_neg_step(g2)*mod_neg_step(g3)*mod_neg_step(g4)...
> > *mod_neg_step(g5)*mod_neg_step(g6)*mod_neg_step(g7);
> =============
>
> No idea what this is for. I think it should be unnecessary with the above.

thank you very much. now, i cant get different results while i change the values of constants :)

but it gave me a flat shape. is this because of the function?



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