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Jose

Label 14 names in colorbar

Asked by Jose
on 5 Nov 2012

Hi everyone!

I need to put 14 labels in a colorbar in a surf. If I put 14 labels, only shows 7 labels (first 7).

The max number of labels I can put is 12, after that only put the half.

Can you help me?

Thanks!

  1 Comment

Jan Simon
on 5 Nov 2012

It is not clear, what code produces this problem. It would be helpful to create an answer, if you post the relevant part of your program to reduce the need to guess what "if I put 14 labels" exactly means.

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4 Answers

Answer by Image Analyst
on 5 Nov 2012
Edited by Image Analyst
on 5 Nov 2012

I can reproduce what you say, but I don't know how to solve it. I wasn't able to solve it in 5 minutes. I post my code here in case others want to take a shot at it:

numberOfColors = 14;
myColorMap = rand(numberOfColors,3);
colormap(myColorMap);
for c = 1 : numberOfColors % Make tick mark labels.
	ca{c} = sprintf('Color #%d', c);
end
colorbar('YTickLabel', ca);

What's even weirder is that it seems to "wrap around" if you give less than some number. try putting in 4 or 6 into my code for numberOfColors.

  0 Comments


Answer by Jan Simon
on 5 Nov 2012
Edited by Jan Simon
on 5 Nov 2012

Tiny modification of Image Analysts code:

numberOfColors = 14;
myColorMap = rand(numberOfColors,3);
colormap(myColorMap);
for c = 1:numberOfColors % Make tick mark labels.
   ca{c} = sprintf('Color #%d', c);
end
colorbar('YTickLabel', ca, 'YTick', 1.5:numberOfColors+0.5);  % <== Changes

The num,ber of TickLabels must equal the number of Ticks.

  1 Comment

Image Analyst
on 5 Nov 2012

Ah, so that's the trick! Thanks. I had thought it would just kind of uniformly distribute the labels, but a careful reading of the help shows you are right: " To substitute strings for numbers along a colorbar, you define a label for each tick location." And it looks like the very bottom of the colorbar is 1 and the bottom (not top) of the top color (#14 in our example) is 14, so that's why you had to add 0.5 to make the label be in the middle of each colored panel in the colorbar.


Answer by Jonathan Epperl
on 5 Nov 2012

Maybe I don't understand your question properly, but if I do, then you could do it like so:

surf(peaks)
c = colorbar;
set(c,'YTick',-6:8,'YTickLabel',num2str((-6:8)','%d'))

Now you got 15 labels on your colorbar, and since you have the handle of it, you can do all kinds of other stuff to it, too.

  0 Comments


Answer by Jose
on 6 Nov 2012

thanks to all! :D

  0 Comments


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