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

Question

James 2020-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/539123-how-can-i-set-axis-s-tick-or-scale-like-photo-help-plz

评论： Star Strider 2020-5-31

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

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Answer 1

Star Strider 2020-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/539123-how-can-i-set-axis-s-tick-or-scale-like-photo-help-plz#answer_443687

编辑：Star Strider 2020-5-31

在 MATLAB Online 中打开

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 —

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James 2020-5-31

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

Star Strider 2020-5-31

As always, my pleasure!

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Answer 2

David Hill 2020-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/539123-how-can-i-set-axis-s-tick-or-scale-like-photo-help-plz#answer_443695

在 MATLAB Online 中打开

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;