Custom colored bar graph for a vector

Hi, I have a vector x=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15] and corresponding y=[1 2 3 1 1 1 2 3 3 1 3 3 3 2 3]. I should generate a bar plot {bar(x,y)} such that bar corresponding to different numbers are in different colors. For example: Bar color corresponding to 1's should be red, Bar color for all 2's should be yellow and so on....Can someone please help with this?

Answer 1

[Azzi Abdelmalek]

x=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15]
y=[1 2 3 1 1 1 2 3 3 1 3 3 3 2 3]
cl='rgyb'
for k=1:numel(x)
  bar(x(k),y(k),'FaceColor' ,cl(y(k)))
  hold on
end

[Sowmya MR]

Thank you. This works. Also is there a way to display the corresponding values of y on top of the bar?

[Chad Greene]

Nice! Or a more generalized form in case y = y+5;

x=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15] ;
y=[1 2 3 1 1 1 2 3 3 1 3 3 3 2 3];

uniquey = unique(y); 
Ncolors = length(uniquey); 

hold on
cmap = jet(Ncolors); 
for k = 1:length(x)

     bar(x(k),y(y(k)),'facecolor',cmap(uniquey==y(k),:))
  end

[Chad Greene]

Sowmya- To get the text labels put this at the end:

text(x,y,num2str(y'),'horiz','center','vert','bottom')
box off

Answer 2

[Chad Greene]

You can set the facecolor of bar(s) when you call the bar function. Below I'm defining the rgb values of 15 colors with jet. The display is colorful, but perhaps not the most elegant design for data display. Fewer colors is usually better.

x=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15] ;
y=[1 2 3 1 1 1 2 3 3 1 3 3 3 2 3];

hold on
cmap = jet(length(x)); 
for k = 1:length(x)
   bar(x(x==x(k)),y(x==x(k)),'facecolor',cmap(k,:))
end