Plot a function with respect to another function

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Saeid Hajizadeh
Saeid Hajizadeh 2014-3-11
评论： Walter Roberson 2014-3-12
Dear guys,
I have two functions, each function of two variables x,y; namely z1 = f1(x,y) and z2 = f2(x,y) and want to plot z1 vs z2. The functions are below:
0 <= x,y <= 1;
z1 = -(1-x) .* ( (y./(1-x)).*(log((y./(1-x)))) + (1-((y./(1-x)))).*(log(1-((y./(1-x))))) ) /log(2);
z2 = -(1-y) .* ( (x./(1-y)).*(log((x./(1-y)))) + (1-((x./(1-y)))).*(log(1-((x./(1-y))))) ) /log(2);

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Walter Roberson
Walter Roberson 2014-3-11
Assign values to x and y, do the calculations producing z1 and z2, then
plot(z1, z2)
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Saeid Hajizadeh
Saeid Hajizadeh 2014-3-12
编辑：Saeid Hajizadeh 2014-3-12
Thanks to all guys, I focused. The answer is right. My problem was that I used to put directly p1 and p2 into R12 and R21. The correct code is given below:
p1 = 0.01:0.001:0.49;
p2 = 0.01:0.001:0.49;
for i=1:1:481
for j=1:1:481
R12(i,j) = -(1-p1(i)) .* ( (p2(j)./(1-p1(i))).*(log((p2(j)./(1-p1(i))))) + (1-((p2(j)./(1-p1(i))))).*(log(1-((p2(j)./(1-p1(i)))))) ) /log(2);
R21(i,j) = -(1-p2(j)) .* ( (p1(i)./(1-p2(j))).*(log((p1(i)./(1-p2(j))))) + (1-((p1(i)./(1-p2(j))))).*(log(1-((p1(i)./(1-p2(j)))))) ) /log(2);
end
end
plot(R12,R21)
Now this is a large number of diagrams plotted simultaneously the envelope of which is the answer. I am trying to find a way to extract envelope here. If you have any idea, I appreciate having them (I am very basic in Matlab)
Walter Roberson
Walter Roberson 2014-3-12
Also if y = 0 then you multiply 0 by log(0) which is going to give you NaN.

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