How can I specify axis spacing?

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Susan 2019-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/466715-how-can-i-specify-axis-spacing

评论： Star Strider 2019-6-12

采纳的回答： Star Strider

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Hey Guys,

I am plotting a figure that x takes values of [4 8 16 32 64 128 256 512 1024]. I use

%%
x = [4 8 16 32 64 128 256 512 1024];
plot(x, Y)
set(gca,'XTick',x)

The problem is the x-axis = [4 8 16 32 ] overlap and it's not readable. How can I fixed that? Many thanks in advance!

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Jan 2019-6-12

Use a logarithmic scale. Then the ticks are equi-distant.

Susan 2019-6-12

Thank you so much! Could you please take a look at the following comment and let me know if you have any sugesstions? Thanks in advance!

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Answer 1

Star Strider 2019-6-12

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在 MATLAB Online 中打开

One option:

x = [4 8 16 32 64 128 256 512 1024];
plot(log2(x), Y)
set(gca,'XTick',log2(x), 'XTickLabel',x)

It would be a bit easier if we knew ‘Y’, and what you wnat it to look like.

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Susan 2019-6-12

在 MATLAB Online 中打开

Thank you so much for your reply. It was very helpful.

However, it gave me the same distance between 4-8 and between 512-1024. I was wondering if it is possible to have the same scale as it given in the above figure (, i.e., the distance between 512-1024 is twice of the distance between 256-512 and so on) with readable x values from 4 to 64? Any idea would be greatly appreciated.

This is the Y values (each row for each curve)

%%
0752    0.1186    0.1696    0.2301    0.2958    0.3550    0.3986    0.4259    0.4414
0805    0.1294    0.1897    0.2651    0.3526    0.4365    0.5016    0.5440    0.5686
0735    0.1208    0.1819    0.2632    0.3648    0.4706    0.5587    0.6193    0.6556
0595    0.0999    0.1546    0.2325    0.3387    0.4609    0.5732    0.6567    0.7094
0424    0.0726    0.1154    0.1805    0.2780    0.4047    0.5375    0.6482    0.7244
0267    0.0464    0.0755    0.1222    0.1985    0.3109    0.4486    0.5829    0.6879
0153    0.0268    0.0443    0.0735    0.1246    0.2083    0.3274    0.4660    0.5942
0082    0.0145    0.0242    0.0408    0.0711    0.1246    0.2103    0.3273    0.4568
0043    0.0076    0.0127    0.0216    0.0382    0.0689    0.1222    0.2040    0.3098

Star Strider 2019-6-12

在 MATLAB Online 中打开

As always, my pleasure.

Try this:

x = [4 8 16 32 64 128 256 512 1024];
Y = [ 0.0752    0.1186    0.1696    0.2301    0.2958    0.3550    0.3986    0.4259    0.4414
      0.0805    0.1294    0.1897    0.2651    0.3526    0.4365    0.5016    0.5440    0.5686
      0.0735    0.1208    0.1819    0.2632    0.3648    0.4706    0.5587    0.6193    0.6556
      0.0595    0.0999    0.1546    0.2325    0.3387    0.4609    0.5732    0.6567    0.7094
      0.0424    0.0726    0.1154    0.1805    0.2780    0.4047    0.5375    0.6482    0.7244
      0.0267    0.0464    0.0755    0.1222    0.1985    0.3109    0.4486    0.5829    0.6879
      0.0153    0.0268    0.0443    0.0735    0.1246    0.2083    0.3274    0.4660    0.5942
      0.0082    0.0145    0.0242    0.0408    0.0711    0.1246    0.2103    0.3273    0.4568
      0.0043    0.0076    0.0127    0.0216    0.0382    0.0689    0.1222    0.2040    0.3098];
xv = [linspace(x(1),x(6),6)*1.5 (x(7:end))];                    % X-Vector
plot(xv, Y)
set(gca,'XTick',xv, 'XTickLabel',x, 'FontSize',8)
xlim([min(x) max(x)])

producing:

It linearly spaces the values below 128, then uses the natural spacing for numbers above that. That is the only way I can think of to meet your readability and spacing needs.

Susan 2019-6-12