Help With Running while loop for a list

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Joe
Joe 2014-4-2
评论： Joe 2014-4-2
I am able to run this doing it for a single value for P, but now i would like to do it for a range of values for P (i.e. a vector of 100 P values from 1 to 100), however I am getting an error and am not sure that I understand it.
Here is the code with the single P value problem
function Z = RKZ(epsilon, Sigma, sigma, P, Pc, Tc, T, phi, xh, xl)
format long
Pr = P/Pc
Tr = T/Tc
x = xl + xh
beta = Sigma*(Pr/Tr)
q = phi/(Sigma*Tr^(1.5))
Y = @(X) 1 + beta - q*beta*((X-beta)/((X + epsilon*beta)*(X + sigma*beta))) - X
E = 0.0000000000001
Yx = Y(x)
while abs(Yx) > E
x = (xl + xh)/2
Yx = Y(x)
if Y(x) > 0
xh = x
else
xl = x
end
x
end
Z = x
end
And this is the code for the vector of P values (the one that I am having issues with):
function Z = Zplot(epsilon, Sigma, sigma, p1, p2, Pc, T, Tc, phi, xh, xl)
P = linspace(p1, p2, 100)
format long
Pr = P./Pc
Tr = T./Tc
i = 1:length(P)
x = ones(1,100)
beta = Sigma.*(Pr./Tr)
q = phi./(Sigma.*Tr.^(1.5))
Y = @(X) 1 + beta - q.*beta.*((X-beta)./((X + epsilon*beta).*(X + sigma*beta))) - X
E = 0.0000000000001
Yx = Y(x)
for i = 1:length(Yx)
while abs(Yx(i)) > E
x(i) = (xl + xh)/2
Yx(i) = Y(x(i))
if Y(x(i)) > 0
xh = x(i)
else
xl = x(i)
end
x (i)
end
Z = x
end
end
I input these values:
Zplot(0, 0.08664, 1, 1, 100, 73.83, 304.2, 325, 0.42748, 0, 1)
and this was the error that I got:
In an assignment A(I) = B, the number of elements in B and I must be the same.
Error in Zplot (line 17)
Yx(i) = Y(x(i))
  2 个评论
dpb
dpb 2014-4-2
...however I am getting an error and am not sure that I understand it.
Well, I'm sure we don't when you don't let us know what the error is. Cut 'n paste the whole error text in context w/ the code that used to call the function.
Joe
Joe 2014-4-2
I apologize for being unclear, I added these details in the question.

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