Barcharts colours based on other vectors

Hi all,

I have 3 vectors a,b,c with 4 numbers in each of them

I create another vector d with all the values of vectors a,b,c Sorted.

then I want to plot a barchart of vector d, BUT I would like to have different colours in the bars based on which vector they belong.

Can you help me with this?

for example:

values belong to vector a=green colour

values belong to vector b=blue colour

values belong to vector c=orang colour

Hope the quesiton is clear

thanks in advance

Nikolas

Answer 1

[Adam Danz]

This has been addressed before within the forum (example1 ,example2).

The basic idea is to store the output handle to the bar objects

bh = bar(____); 

Set the FaceColor to flat

bh.FaceColor = 'flat'; 

Redefine the CDdata which defines the color of each bar

colorData = bh.CData;  % Current color arrangement. 

% Example: change color of bar #2 to red
bh.CData(2,:) = [1 0 0]; 

% Example: define the colors based on the jet colormap
bh.CData = jet(size(bh.CData,1));

[Nikolas Spiliopoulos]

Hi again ,

thanks for the answer.

It's close to what I want but not exactly, as I would like the values that come from the same vector to have the same colour. Maybe I didn't put the question very clearly, apologies.

example

a=[10 20 30];

b=[15 25 50];

c=[5 40 80];

d=[a b c];

d_sorted=sort(d);

bar(d_sorted)

values coming from a=orange colour

values coming from b=green colour

values coming from c=bluecolour

I had a look to the examples, but I don't really understand the logic

thanks again!

[Adam Danz]

You just need to index the color values accordingly.

a = [10 20 30];
b = [15 25 50];
c = [5 40 80];

d=[a b c];
ID = [ones(size(a)), ones(size(b))+1, ones(size(c))+2];
[d_sorted, sortIdx] = sort(d);
ID_sorted = ID(sortIdx); 

bh = bar(d_sorted);

colors = jet(max(ID)); % Define a colormap
bh.FaceColor = 'flat';
bh.CData = colors(ID_sorted,:) % set the colors.

[Nikolas Spiliopoulos]

alright thanks, it works!!!