How to Rescale X Axis in Plot

Hi,

I'm plotting a 1470x28 double and I need to rescale the x axis. Right now, the x axis shows data from 0 to 1470, but I need to convert the units of the x axis so that they show the same data, but it says 0 to 2940 instead. Basically i just want the 1500 on the bottom right to become 3000 and I want the data to still extend to the 3000 tick. I attached a pic of what I currently have. Thanks.

Answer 1

[Les Beckham]

Since you didn't show the code you used to generate the plot or include the data, I'll have to guess what the problem might be.

data = rand(28,1470); % made up data
for i = 1:28
    data(i,:) = data(i,:) + i; % offset the data so it won't be on top of each other
end
plot(data') % maybe you were plotting without an x vector?

t = linspace(0, 1470*2, 1470); % create a vector specifying the data to use for the x axis
figure
plot(t, data) % plot with new x data

Note the new range on the x axis.

Answer 2

[Voss]

Maybe this example will show you how you can do that.

First, I'll create a random matrix the same size as yours:

y = rand(1470,28);

And plot it like you are doing now (maybe):

subplot(3,1,1)
plot(y)
title('plot(y)')

That plots y against the sample numbers 1:1470.

Another way to do that is to explicitly use those numbers as x (the first argument) in plot:

subplot(3,1,2)
plot(1:1470,y) % same as first plot
title('plot(x,y)')

If you do it that way, then you can make x whatever you want (in this case, multiplying by 2):

subplot(3,1,3)
plot(2*(1:1470),y) % doubling x
title('plot(2*x,y)')