Function for setting tick markers on a variable length x axis.

Hi,

I'm using Matlab to create a (primitive) reverberation unit, where the time based output will obviously change each time the program is run dependent on various factors.

The output (in samples) will always be a multiple of Fs (44100). My current plot code is as follows:

    xlabel ('Time (Seconds)')
    set(gca,'XTick',[Fs/2 Fs 3*Fs/2 Fs*2 5*Fs/2 Fs*3])   %Set the points at which tick markers occur
    set(gca,'XTickLabel',{'0.5','1','1.5','2','2.5','3'})    %Sets the text under tick markers

This works for signals up to 3 seconds, but if I was to add anything longer then the tick markers will be absent (obvious). An amateur solution to this would simply be to create a very long list (say up to 10 seconds worth) of ticks that will appear when required (7*Fs/2 etc etc).

However, there must be a clever way of creating a function to do this (or there may be something already in Matlab I have overlooked?).

I was thinking along the lines of:

 T = (length(x)/Fs) %Gives time in seconds of output

Then based on that time having a function to create a vector of numbers that goes from T/(T*2), to T. Giving me tick markers from 0.5 to T seconds. Then a similar calculation for the X Labels.

(I'm amateur at function calling etc, so go easy on me!)

Thanks a lot,

Chris

Answer 1

[John Barber]

Hi Chris,

I'm not exactly sure what you're looking for, but you might want to try my File Exchange program, xtickinterval, which you can find here: http://www.mathworks.com/matlabcentral/fileexchange/30674. This will draw ticks and labels at a user-specified interval, regardless of the axis length. It will update the ticks/ticklabels automatically when the axis limits change.

If it doesn't do exactly what you want, you might get some ideas of how to implement it by looking through the code.

-John