Is there a mistake on my code which determines value that minimizes the function?

2018 7 26
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更新时间：2018 7 26
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I have been creating a minimal code located at the code-box for minimize the function, but i'm not sure working of code is correctly. Is there any wrong?
Thx.
clear all
clc
slo=[0.01 0.012 0.013 0.012 0.008 0];
for i=1:1:numel(slo);
WR(i)=0.01*9.81*1700*cos(i);
WL=@(velo) 0.5*0.25*1.2*2.65.*velo^2;
WS(i)=9.81*1700*sin(i);
WB=0;
end
WT=@(velo) sum(WR)+WL(velo)+sum(WS)+WB;
fun = @(velo) WT(velo);
x1 = 50/3.6;
x2 = 90/3.6;
options = optimset('Display','iter');
velo = (fminbnd(fun,x1,x2,options))*3.6 %km/h

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Walter Roberson
Walter Roberson 2018-7-26

1 个投票

You could give a smaller tolerance in your options if you wanted to get a more accurate result.
Or you could just skip the fminbnd and use x1 as location where the minimum occurs.
Your function calculates a quadratic function with its minima at 0, so the bound closest to 0 is always going to be the point of the constrained minima.

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