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clc
s=0.35:0.001:0.60;
i=0.2:0.001:0.60;
[x,y]=meshgrid(s,i);
P=(-3/10*s-6/25-3/10*i)/(9/200*i*s+9/100*i^2*s+9/100*i*s^2+81/10000*i-9/100*(1-i)^2*(1-s)^2-9/200*(1-s)^2*i-441/5000*(1-i)^2*s+s^2*i^2)
mesh(x,y,P)
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clc;clear;
m = 100;
s=linspace(0.35,0.60,m);
i=linspace(0.2,0.60,m);
[x,y]=meshgrid(s,i);
P=(-3/10*x-6/25-3/10*y)./(9/200*y.*x+9/100*y.^2.*x+9/100*y.*x.^2+...
    81/10000*y-9/100*(1-y).^2.*(1-x).^2-9/200*(1-x).^2.*y-441/5000*(1-y).^2.*x+x.^2.*y.^2);
mesh(x,y,P)
xlabel('x')
ylabel('y')
zlabel('z')
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