Put multiple loglog plots on one figure

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Josh Glenn
Josh Glenn 2018-10-31
编辑： madhan ravi 2018-10-31
Hello...I am trying to put 3 loglog plots on the same figure but this is not working. Any recommendations or small things I'm missing?
Thanks! :)
clear
clc
close all
format short
Re = 10^4:1000:10^8;
%Bruus
B = @(x) .25*(log((x/3.7)+(5.74./(Re).^.9)));
%Haaland
H = @(x) (1./(-1.8*log((x/3.7)^1.11+(6.9./Re)))).^2;
%Figure 1
eD1 = 0;
B1 = B(eD1);
H1 = H(eD1);
figure;
loglog(Re,B1,'r')
hold on
loglog(Re,H1,'--')
title('f vs. Re e/D = 0');
xlabel('Re');
ylabel('f');
legend('Bruus','Haaland');
grid on

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回答（1 个）

madhan ravi
madhan ravi 2018-10-31
Isn’t this normal? because the domain of the log function starts from 0+ to wards positive infinity that’s why it’s ignoring negative arguments.
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Josh Glenn
Josh Glenn 2018-10-31
okay so it should put them on the same graph? even when the mathematical error is fixed it still only puts one on the log scale graph. Is there something small I'm missing?
madhan ravi
madhan ravi 2018-10-31
It should plot all the graphs if you fix the mathematical error.

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