how can I set axis's tick or scale like photo.. help plz,,

CD = @(Re) 24./Re+(2.6*Re/5)./(1+(Re/5).^1.52)+(0.411*(Re/263000).^(-7.94))./(1+(Re/263000).^(-8))+(0.25*Re/10^6)./(1+Re/10^6);
fplot(CD, [0.1 1000000])

it is my result but I want like under. what should I use which command to get under.I know axis scale is a problem. I dont know which command need. please help me

Answer 1

[Star Strider]

Add these lines:

grid
set(gca, 'XScale','log', 'YScale','log', 'YLim',[0.01 100])

so the complete code is now:

CD = @(Re) 24./Re+(2.6*Re/5)./(1+(Re/5).^1.52)+(0.411*(Re/263000).^(-7.94))./(1+(Re/263000).^(-8))+(0.25*Re/10^6)./(1+Re/10^6);
fplot(CD, [0.1 1000000])
grid
set(gca, 'XScale','log', 'YScale','log', 'YLim',[0.01 100])

See Axis Properties for more options.

EDIT —

Added plot image —

[James]

Thank you so much!! now I'm going to search for other problems!!

[Star Strider]

As always, my pleasure!

Answer 2

[David Hill]

CD = @(Re) 24./Re+(2.6*Re/5)./(1+(Re/5).^1.52)+(0.411*(Re/263000).^(-7.94))./(1+(Re/263000).^(-8))+(0.25*Re/10^6)./(1+Re/10^6);
re=.1:.1:10000;
semilogx(re,CD(re));
grid on;

[James]

Thankyou so much for answering my question!! sorry for I choosing another.... but I got another useful command from you. Thanks