figure - plot, semilogx, loglog, ...

Question

Robin L. 2019-6-12

0
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回答： Jesús Zambrano 2019-8-4

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Hello,

A small question for you today :

% let us take x, y, some random values (> 0)

Are the following codes the same ?

plot(x, y);
set(gca, 'XScale', 'log');

and

semilogx(x, y);

?

plot(x, y);
set(gca, 'XScale', 'log');
set(gca, 'YScale', 'log');

and

loglog(x, y);

?

And so on...

If true, finally, what is the best pratice ?

Thanks !

Robin

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Answer 1

Jesús Zambrano 2019-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/466635-figure-plot-semilogx-loglog#answer_386118

Hi Robin,

Indeed, those codes give the same results.

If you know in advance that your plot should have one or both axes in log scale, I recommend you to use the semilogx or loglog commands: the execution time (if you have many data to be plotted in many figures) will be shorter, and your script will have less lines.

Best,

Jesús