I want to scale each pixel width and height in imagesc but not use pcolor command

Hello,

I want to scale each pixel width and height in imagesc but not use pcolor command. The reason I don't want to use pcolor is it plots the center of each (x1-x2) and (y1-y2). Is there any adjustments in imagesc that plot an image with different pixel sizes according to x and y values?

Thanks Farz

Answer 1

[Walter Roberson]

imagesc() accepts 'XData' and 'YData' parameter, which together allow you to control the data coordinates of the center of the lower-left and upper-right pixels. The axes properties XLim, YLim, DataAspectRatio, Position, and Units then work together to determine the mapping of data coordinates to physical screen coordinates.

For example if you had arranged for a square plotting box area, and you had a square data array, then using imagesc() 'XData' [0 10], 'YData', [0 20] would place the center of the lower left at [0 0] and the center of the upper right at [10 20] which would have the effect of making the Y scale twice as large as the X scale for the image.

[Farz Tak]

Thanks, I'll work on it. Now I have at least some clue to start with. FarZ

[Farz Tak]

[Farz Tak]

@walter This plot is with pcolor but I want to have the same variations in pixel sizes in imagesc. Your suggestion changes the ratio of the plot in general but not each pixel. ANy suggestion on this?

[Walter Roberson]

I = rand(32,32); imagesc(I, 'XData', [.5 32.5], 'YData', [.5 65]); axis image

The pixels that come out will not be square.

[Farz Tak]

Thanks but as you see this scale the width and height of the whole plot. What I am looking for is what that can draw each pixel based on its x and y (like what we have in all 1-D plots).