MATLAB Answers

how do I modify the axis in plot(x,y)?

122 views (last 30 days)
claudio
claudio on 7 Mar 2011
Answered: laurent jalabert on 23 May 2019
Hi, I need to plot the following vectors: x=[0.05 0.1 0.3 0.5 1 5 10 20 30 40 50] y=[0.8 0.83 0.9 0.93 0.93 0.9 0.9 0.94 0.95 0.95 0.95] plot(x,y)
My problem is that the vector x don't appears explicitly in the axis and also the scale of the axis is not constant. I need something like:
----------------------------------------------------
0.05 0.1 0.3 0.5 1 5 10 200 ...
your help will be very useful for me

  0 Comments

Sign in to comment.

Accepted Answer

Matt Tearle
Matt Tearle on 7 Mar 2011
So you want the x-axis to be nonlinear (but not necessarily log)? Well, you can always cheat. Do what Matt Fig suggests, but change the plot command to just plot(y) and the next line to
set(gca,'XTick',1:length(x))

  2 Comments

claudio
claudio on 8 Mar 2011
thank you very much, this work fantastic!!
I appreciate you response.
PD: are there any way to put the first and the last point not on the vertical axis but to leave a interval for to have a better vision of these points in the graphic?
I used to use axis([xmin xmax ymin ymax]) but now doesn't work :(
Matt Tearle
Matt Tearle on 8 Mar 2011
I'm not sure I understand what you're after. If you want to leave a bit of space above and below the data, just use axis or ylim and pad it out a bit: ylim([ymin-dy ymax+dy]) (where dy is some small "padding" value)

Sign in to comment.

More Answers (2)

Matt Fig
Matt Fig on 7 Mar 2011
Is this more to your liking?
x=[0.05 0.1 0.3 0.5 1 5 10 20 30 40 50];
y=[0.8 0.83 0.9 0.93 0.93 0.9 0.9 0.94 0.95 0.95 0.95];
plot(x,y)
set(gca,'xtick',x);
set(gca,'xticklabel',num2str(x.'));
Now, separately try this and see if it is what you need. When you have such large differences in scale, there can be problems representing all the data points on an axis.
set(gca,'xscale','log') % Set to linear to go back.

  1 Comment

claudio
claudio on 7 Mar 2011
Ok Matt Thanks,
Now, I just need to represent all the data points on x axis uniformly, but I can't find the way. Could you help me pls?

Sign in to comment.


laurent jalabert
laurent jalabert on 23 May 2019
hello, what about a function to modify the xTicks label with a non-linear function of x ?
For example, displaying the grid as x^3 ?

  0 Comments

Sign in to comment.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by