How do I change the x and y coordinates in a colormap?

I have a 2-D array fourier tranaformed with each value in it indicates the value at a certain frequency and wavevector(each row represent a frequency with interval df and each column represent a wavevetor with interval dk), when I use "imagesc" to plot, the coordinate on x-axis and y-axis show the number of the column and row, how can I change it into the position and time I want? Like for [i,j], the coordinate should be (i*dk,j*df).

Y = fft2(array);
Yshift = fftshift(Y);
f1 = figure;
imagesc(abs(log(Yshift)));
colorbar;

Answer 1

[Adam]

doc imagesc

shows that the first two arguments can be the x data and the y data if you use the 3-argument syntax or property-value pairs to explicitly set XData and YData.

Alternatively, if you keep the handle from your imagesc call:

hImage = imagesc(...)

you can change

hImage.XData = ...
hImage.YData = ...

to appropriate values.