error message contain ::: Error using colebrook (line 2) Not enough input arguments. how i can solve it please?

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Moath Maqableh
Moath Maqableh 2017-4-29
评论： Walter Roberson 2017-4-29
function F = colebrook(Re,K)
F= (1/(-2*log10((K/3.7)+(2.51/Re*sqrt(F)))))^2;
for i=1:20
Re=i*10^3;
K=0.00002;
colebrook(Re,K)
end
end

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Walter Roberson
Walter Roberson 2017-4-29
编辑：Walter Roberson 2017-4-29
colebrook = @(Re,K) (1/(-2*log10((K/3.7)+(2.51/Re*sqrt(F)))))^2;
cb = zeros(1,20);
for i=1:20
Re=i*10^3;
K=0.00002;
cb(i) = colebrook(Re,K);
end
cb
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Walter Roberson
Walter Roberson 2017-4-29
Presuming that the idea is to find the F that balances the equation:
colebrook = @(Re,K) (1/(-2*log10((K/3.7)+(2.51/Re*sqrt(F)))))^2;
cf = @(Re,K,F) (1/(-2*log10((K/3.7)+(2.51/Re*sqrt(F)))))^2 - F;
cb = zeros(1,20);
for i=1:20
Re=i*10^3;
K=0.00002;
cb(i) = fzero(@(F) cf(Re,K,F), [0 1]);
end
cb
cb =
Columns 1 through 6
0.0212456669959142 0.0176438993118644 0.0159918090443276 0.0149809406929249 0.0142775420985982 0.0137506154874361
Columns 7 through 12
0.0133364599564298 0.0129997383391223 0.0127190013698845 0.0124803457077015 0.0122742958406683 0.0120941332432202
Columns 13 through 18
0.0119349390546334 0.0117930153254043 0.0116655193666966 0.0115502240640389 0.0114453557666283 0.01134948165294
Columns 19 through 20
0.0112614296189815 0.0111802301156452

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