Change amount of ticks on a colorbar

Hi.

I have a 2D contour

    contour(handles.Object,x,y,z,...)

where I set the colour map using an rgb matrix

b = (.23 .6 .8;...
     .7 .8 .9;...
     etc)
caxis([20 50]);
cbr = colormap(b)
colorbar

By default, the colorbar has seven ticks. What I want to do is create a colorbar in the range between 20 and 50 with a tick right at the bottom marking "20", one right at the top marking "50" and ticks marking 22, 24, 26, 28,... (steps of 2) inbetween.

If I type

set(cbr,'YTickLabel',{'20','22','24','26',[...],'50'})

the colormap only returns the first seven values in the positions of the initial five ticks.

Is there a way to manipulate the AMOUNT and POSITIONS of the ticks so that I can get a colorbar as described above?

Thanks!

Marc

Answer 1

[Laurent]

The 'YTick' property contains the locations of the ticks on the Y axis, so I guess that

set(cbr,'YTick',20:2:50)

should do the trick.

[Marc Jakobi]

Thanks. That did the trick.

[Utsav]

Thanks it helped me a lot too

Answer 2

[Diana]

Is there any way to set the number of ticks? I mean whatever the values are, I want always 5 ticks in the colorbar.

[Marc Jakobi]

You can use linspace.

 set(cbr, 'YTick', linspace(a, b, 5));

Where a is the lower tick and b the upper one.