YTickLabel in colormap will be shown with some specified value (not show all)

I have code and the result as below:

%%How to plot each matrix in a cell in 3d plot(1 matrix with 1 color) ?
% Generate Sample data cell A(1x10 cell array)
clear; clc;
A = cell(1,10); % cell A(1x10 cell array)
for kk = 1:numel(A)
  z = 10*rand()+(0:pi/50:10*rand()*pi)';
  x = 10*rand()*sin(z);
  y = 10*rand()*cos(z);
  A{kk} = [x,y,z];
end  
A_6 = A(1:6);        % generate a cell with the first 6 matrices in "A" cell array 
                     % The numer "6" can be changed to be any number which you want to plot them by colormap                      
newA = vertcat(A_6{:});                   %Concatenating all matrices inside A vertically
numcolors = numel(A_6);                   %Number of matrices equals number of colors
colourRGB = hsv(numcolors);             %Generating colours to be used using hsv colormap
colourtimes = cellfun(@(x) size(x,1),A_6);%Determining num of times each colour will be used
colourind = zeros(size(newA,1),1);      %Zero matrix with length equals num of points
colourind([1 cumsum(colourtimes(1:end-1))+1]) = 1;
colourind = cumsum(colourind);          %Linear indices of colours for newA
scatter3(newA(:,1), newA(:,2), newA(:,3), [], colourRGB(colourind,:),'filled');
%if you want to specify the size of the circles, use the following line instead:
% scatter3(newA(:,1), newA(:,2), newA(:,3), colourind , colourRGB(colourind,:),'filled');
grid on;
view(3);                                %view in 3d plane 
colormap(colourRGB);                    %using the custom colormap of the colors we used
%Adjusting the position of the colorbar ticks
caxis([1 numcolors]);
colorbar('YTick',[1+0.5*(numcolors-1)/numcolors:(numcolors-1)/numcolors:numcolors],'YTickLabel', num2str([1:numcolors]'), 'YLim', [1 numcolors]);

I have the image like this:

How can I shown "YTickLabel" with some specified value (not show all) as below figure?

[jonas]

Do you want to keep the ticks but not the label? You can do something like this:

cb=colorbar
cb.Ticks=500:300:3100 %removes empty ticks
cb.TickLabels{3}='' %removes a label but keeps tick

[ha ha]

@jonas . Please see my edit question

[jonas]

save handle for colorbar, cb=colorbar(...) then add

tix=cb.Ticks;
cb.Ticks=tix([1 3 5 6])
cb.TickLabels={'1' '3' '5' '6'};

I would be a bit careful with manipulating the Ticklocation so they do not align with the actual values on the colorbar.

[ha ha]

what do you mean? "save handle for colorbar, cb=colorbar(...)" I add the additional code as follow:

cb=colorbar;
tix=cb.Ticks;
cb.Ticks=tix([1 3 5 6])
cb.TickLabels={'1' '3' '5' '6'};

But, the result is not same as my expect?

[ha ha]

thank@jonas

Answer 1

[ha ha]

Additional code:

cb = colorbar('YTick',[1:numcolors],'YTickLabel', num2str([1:numcolors]'), 'YLim', [1 numcolors]);
  tix=cb.Ticks;
  cb.Ticks=tix([1 3 5 6]);
  cb.TickLabels={'1' '3' '5' '6'};