Emrah
Posts:
8
Registered:
12/30/12


Re: how to plot a function subject to constraints.
Posted:
Jan 7, 2013 10:33 AM


"Matt J" wrote in message <kcenvl$95v$1@newscl01ah.mathworks.com>...
> Set x2 and x3 to NaN where the constraints are not satisfied, e.g., > > G=[g1,g2,g3,g4,g5,g6,g7]; > infeasible=~all(G(:)); > x2(infeasible)=nan; > x3(infeasible)=nan; > > Then plot as normal
i did this:
[g1,g2,g3,g4,g5,g6,g7]=constraints(x1,x2,x3,x4); G1=[g1,g2,g4,g6,g7]; G2=[g3,g5]; infeasible=~all(G1(:))+all(G2(:)); x2(infeasible)=nan; x3(infeasible)=nan; %objective function f=1.10471.*x1^2.*x2+0.04811.*x3.*x4.*(14.0+x2); %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); %plotting surf surf(x2,x3,f,'LineStyle','none');
but still plot returns an empty area.

