Modify the Haaland Function

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Michael Floyd 2019-11-2

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回答： JESUS DAVID ARIZA ROYETH 2019-11-2

I've been asked to modify the Haaland Function. I'm fairly new to matlab, and would appreciate the help.

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JESUS DAVID ARIZA ROYETH 2019-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/488879-modify-the-haaland-function#answer_399510

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here the solution:

function f=Haaland(releps,Re)
if Re<=2300 %if Re <= 2300
    f=64/Re;
else % if Re > 2300 
answer=0.25/(log10(releps/3.7+5.74/Re^0.9))^2; %calculate f using Swamee..
f2=@(x) 1/sqrt(x)+2*log10(releps/3.7+2.51/(Re*sqrt(x))); %Funcion ColeBrook
f=fsolve(f2,answer); %solve function 
end
end