How can I know what element a value came from in a vector?
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I just started using Matlab. I found my minimum value of a given vector, but I need to know what the corresponding value is in another vector. Is there a way to know where the exact element is?
I need to know my "r" value for the cheapest.
v=600;
r=[1:.1:100];
h=(v-2.*pi.*((r.^3)./3))./(pi.*r.^2);
cost=(400.*(2.*pi.*r.*h))+(600.*(2.*pi.*r.^2));
cheapest=min(cost)
cheapest =
1.4825e+005
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More Answers (2)
Paulo Silva
on 22 Feb 2011
v=600;
r=[1:.1:100];
h=(v-2.*pi.*((r.^3)./3))./(pi.*r.^2);
cost=(400.*(2.*pi.*r.*h))+(600.*(2.*pi.*r.^2));
cheapest=min(cost);
Minr=r(cost==cheapest) %The r value that minimizes the cost function
%check if the value is correct on a figure
clf
hold on
plot(r,cost) %draw the cost function
plot(Minr,cheapest,'rx') %mark the minimum value
axis([0 10 0 5e5])
grid on
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