Why is my iteration not working. ? ( the solution array has all the same value from first iteration )

2017 11 16
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更新时间：2017 11 24
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%function F = Gaddis(x)
for (i = 1:40)
vol(1) = 5*10^(-6); % volumetric gas flow rate
sig = 0.0728;
do = 6*(10^(-3));
den = 998;
g = 9.81;
mu = 8.9*10^(-4);
s = (6*do*sig/(den*g));
L = (81*mu*vol(i)/(pi*g*den));
T = (135*(vol(i)^2)/(4*(pi^2)*g));
F = (x^3) - s - (L/x) - (T/(x^2));
vol(i+1) = vol(i) + 10^(-6);
end
end
I used fsolve solver to solve this function . '
As my volume changes , i am supposed to get new values of diametre , but it shows the same value for all the 40 iterations.
command code xsol(i) = fsolve(@(x) Gaddis(x), 0.0001);

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 采纳的回答

Torsten
Torsten 2017-11-16

0 个投票

function main
for i=1:40
vol(i) = 5e-6+(i-1)*1e-6;
xsol(i)=fsolve(@(x)Gaddis(x,vol(i)),1e-4);
end
plot(vol,xsol)
function F = Gaddis(x,vol)
sig = 0.0728;
do = 6*(10^(-3));
den = 998;
g = 9.81;
mu = 8.9*10^(-4);
s = (6*do*sig/(den*g));
L = (81*mu*vol/(pi*g*den));
T = (135*(vol^2)/(4*(pi^2)*g));
F = (x^3) - s - (L/x) - (T/(x^2));
Best wishes
Torsten.

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