How can I change the interval on the y-axis?

Hello everyone,

how can I change the interval on the y-axis?

For istance, if I want to put an interval every 25 or 50.

Thank you.

Answer 1

[Scott MacKenzie]

Here's some example code on how to control the "ticks":

x = 1:5;
y = randi(100, 1, 5);

plot(x,y);
set(gca, 'ylim', [0 100]);
set(gca, 'ytick', 0:5:100);

plot(x,y);
set(gca, 'ylim', [0 100]);
set(gca, 'ytick', 0:25:100);

plot(x,y);
set(gca, 'ylim', [0 100]);
set(gca, 'ytick', 0:20:100);

[Pul]

Yes, I tried, but I got the result you can see in the picture.

But the scale is wrong, because the value 30, for cyan and magenta data, should be lower and not at the end.

Thanks.

Answer 2

[Pul]

set(gca, 'ylim', [0 1400]);
set(gca, 'ytick', 0:25:1400);

Yeah, I know.

I tried in this way (every 25). But if I don't want to have labels so close but just some labels every 25?

[Scott MacKenzie]

You used an answer box for your reply comment. Oops.

In your example, the y-axis limits go from 0 to 1400, and you have asked for ticks at 0, 25, 50, 75, etc., up to 1400. So, of course, the labelling is cluttered. I'm not sure what you are aiming for. What about...

set(gca, 'ylim', 0:100:1400);

That will yield less clutter.

[Pul]

Thank you.

Considering that the cyan and magenta data are not so visible, I was wondering if it was possible to add,on the right y-axis, another "numerical scale" related to the cyan and magenta data.

[Scott MacKenzie]

Yes, but this is starting to sound like a different question. And we're commenting here in the answer box. Ouch!

But, to your point, yes, you can plot the data that appear in magenta from the right-side axis. They will have their own limits and will be fully visible. See Create Chart with Two y-Axes for details.

[Pul]

Oh yes, I'm going to answer in the right box (see you above).

Answer 3

[Steven Lord]

You can use the yticks and yticklabels functions to control the locations of the ticks and the labels used for those ticks.

x = 0:0.5:32;
y = x.^2;
plot(x, y)

Let's make a copy of that plot (so you can see the difference when I run the code in MATLAB Answers) and update the tick locations.

figure
plot(x, y)
yticks(0:50:1050)

Let's say I want to put ticks every 50 units but only to label multiples of 100.

figure
plot(x, y)
ticklocations = 0:50:1050;
yticks(ticklocations)
% Create the tick labels from the tick locations
% Or you could use
%
% ticklabels = yticklabels;
ticklabels = string(ticklocations);
% Replace the labels for any tick location that's not a multiple of 100
% with a blank label
ticklabels(mod(ticklocations, 100) ~= 0) = "";
yticklabels(ticklabels)