Axes ticks labeling in contourf

Hi

How do I label the X and Y ticks in contourf ? if I have a 20x30 matrix, when I use contourf the x-axis is labeled from 0 to 20 and the y from 0 to 30, how do I change it to different values ( for example the x should be from 100 to 120 and the y from 200 to 230)

Thanks

Shani

Answer 1

[Walter Roberson]

Provide the x and y values at the time of the contourf() call.

http://www.mathworks.com/help/techdoc/ref/contourf.html

contourf(X,Y,Z), contourf(X,Y,Z,n), and contourf(X,Y,Z,v) draw filled contour plots of Z using X and Y to determine the x- and y-axis limits. When X and Y are matrices, they must be the same size as Z and must be monotonically increasing.

Answer 2

[the cyclist]

For example:

set(gca,'XTick',100:2:120,'XTickLabel',100:2:120)

EDIT IN RESPONSE TO COMMENT:

Here is a fuller example:

z = peaks;
figure
contourf(z);
set(gca,'XTick',10:10:40,'XTickLabel',10:10:40)

"gca" means "get current axis".

[Shani Gal]

tried it, it doesn't work

what gca refer to?

[Shani Gal]

Hi

still doesn't work, the x-axis should vary from 0 to 261, I have 20 cells, now they are labeled 2, 4, ...20 and I wish them to be labeled 26.1 (2*261/20) 52.2 ( 4*261/20) and so on...

How do I do that?

Thanks,