How do I define colors for individual bars on my STACKED bar graph according to their values

Hi all,

I'm trying to create a plot as shown in Plot 1. Depending on a value shown in plot 2, the color of the stacked bar (essentially boxes) should change.

After some research, I found the following solution on mathworks:

http://www.mathworks.ch/support/solutions/en/data/1-1T6UHS/

The trouble I'm having now is to adapt the problem to a stacked bar. To keep it simple, I first tried to just change the code from the mathworks solution for stacked charts:

mydata=rand(2,3);                        % here I added a 2nd row
bar_h=bar(mydata,'stack');               % here I added 'stack'
bar_child=get(bar_h,'Children');
set(bar_child,'CData',mydata);

mycolor=[0 0 0;0 0 1;1 0 0];
colormap(mycolor)
set(bar_child,'CDataMapping','direct');

for iCount=1:length(mydata)
    if (mydata(iCount)<.2)
        index(iCount)=1;
    elseif(mydata(iCount)>=.6)
        index(iCount)=3;
    else
        index(iCount)=2;
    end
end

set(bar_child, 'CData',index);
colormap(mycolor);

The first problem arises at the line:

set(bar_child,'CData',mydata);

with the following error:

Error using set
Conversion to double from cell is not possible.

Can you please give me some help in adapting this solution for stacked bars?

Regards,

bearli

Answer 1

[Bearli Ubuku]

Hi, found myself the first answer of how to adapt the mathworks solution:

mydata=rand(3,2);

bar_h=bar(mydata,'stack');

mycolor=[0 0 0;0 0 1;1 0 0];
colormap(mycolor)

bar_child=cell2mat(get(bar_h,'Children'));

for i=1:size(bar_child,1)    
    set(bar_child(i),'CData',mydata(:,i));
    set(bar_child(i),'CDataMapping','direct');
end

for i=1:size(bar_child,1)    
    for iCount=1:size(mydata,1)
        if (mydata(iCount,i)<.2)
            index(iCount,i)=1;
        elseif(mydata(iCount,i)>=.6)
            index(iCount,i)=3;
        else
            index(iCount,i)=2;
        end
    end

      set(bar_child(i), 'CData',index(:,i)');
  end

[Julian Thompson]

Hi, I am trying to do the same (I have Matlab 2015b) and get an error when I try the solution you found:

Error using cell2mat (line 52) CELL2MAT does not support cell arrays containing cell arrays or objects.

Error in Metric_change_0_or_1_mk4 (line 71) bar_child=cell2mat(get(bar_h,'Children'));

Any ideas?