Logarithmic scale with a different base

Question

Ido Gross 2020-8-13

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回答： Joshua Carmichael 2021-8-13

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Hi,

I am trying to plot a function using logaritmic scale on the x axis, with base 2.

my code is:

N = 1:10000;
M = 61;
L = N-M+1; 
ova_complex = ((N.*(log2(N)+1))./(N-M+1));
figure
stem(log2(N),ova_complex)
xlim([6 14])

the graph im getting is good, but i want to show only the integer values on the x axis(i.e. 6,7,8,9)

is there a way to do that?

thanks

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Answer 1

Star Strider 2020-8-13

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Try this:

N = 1:10000;
M = 61;
L = N-M+1; 
ova_complex = ((N.*(log2(N)+1))./(N-M+1));
figure
stem(log2(N),ova_complex)
xlim([6 14])
xt = get(gca, 'XTick');                                 % ADD THIS LINE
xtl = fix(min(xt)):fix(max(xt));                        % ADD THIS LINE
set(gca, 'XTick',xtl)                                   % ADD THIS LINE

That should produce integer ticks and integer tick labels.

.

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Answer 2

hosein Javan 2020-8-13

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add the following after plot

ax = gca; % current axe
ax.XTick = 6:14;

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Answer 3

Walter Roberson 2020-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/579159-logarithmic-scale-with-a-different-base#answer_479331

log2(x) = log(x) *log(2)

log(2) is a uniform scaling and since plots are scaled to fit available space, becomes irrelevant.

So you get the same shape if you use semilogx. And you can lie with the labels if you want. However if you are using datatips you need your approach (unless you program them to lie)

You can use xticks() to choose integer tick locations.