MATLAB Answers

Raffael
1

Bar plot with bars in different colors

Asked by Raffael
on 16 Jan 2013
Latest activity Edited by Dr. Murtaza Khan on 16 Mar 2019
Hi I have the common problem. I have to plot a bar chart with sorted medians for enzymes and the enzymes shall be colored in blue or red depending on their reversibility.
Here is the data:
data = [.142 31 1;.156 7 1;.191 2 0;.251 6 0]
%First column is the sorted value
%Second column is the index for the YTickLabel
%Third column is the reaction direction
% Data(1,3) = 1 -> bar in red
% Data(1,3) = 0 -> bar in blue
uniNames = {'eno','pck','zwf','...'};
%This was the original script....
h = hist(data(1:end,1))
xlabetxt = uniNames(data(:,2));
ylim([0 .5])
text(1:length(xlabetxt),repmat(-max(ylim)/50,length(xlabetxt),1),xlabetxt','horizontalalignment','right','Rotation',90,'FontSize',15)
text
text(.55,77.5,'A','FontSize',15)
ylabel('median log2 fold change','FontSize',15)

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6 Answers

Answer by Thorsten
on 16 Jan 2013
 Accepted Answer

data = [.142 3 1;.156 5 1;.191 2 0;.251 4 0];
%First column is the sorted value
%Second column is the index for the YTickLabel
%Third column is the reaction direction
% Data(1,3) = 1 -> bar in red
% Data(1,3) = 0 -> bar in blue
uniNames = {'eno','pck','zwf','foo' 'bar'};
%This was the original script....
H = data(:, 1);
N = numel(H);
for i=1:N
h = bar(i, H(i));
if i == 1, hold on, end
if data(i, 3) == 1
col = 'r';
else
col = 'b';
end
set(h, 'FaceColor', col)
end
set(gca, 'XTickLabel', '')
xlabetxt = uniNames(data(:,2));
ylim([0 .5]); ypos = -max(ylim)/50;
text(1:N,repmat(ypos,N,1), ...
xlabetxt','horizontalalignment','right','Rotation',90,'FontSize',15)
text(.55,77.5,'A','FontSize',15)
ylabel('median log2 fold change','FontSize',15)

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Answer by Hello kity on 18 Jan 2013
Edited by Hello kity on 18 Jan 2013

you can also manually select bar and color:
bar(1, Data, 'colorcode')
hold on
bar(2, Data, 'colorcode') , bar (3, Data, 'colorcode')
that is what Thorsten does here:
h = bar(i, H(i));

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Iyk
on 17 Apr 2013
AWESOME!!!!!!!!1

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Answer by Luke
on 6 Jul 2017

If you want all your data to be displayed in different colors, an easy way to do this is:
bar(diag(data_vector),'stacked')

  1 Comment

This is the most easiest way that we can do. Thanks a ton.

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Answer by Raffael
on 17 Jan 2013

Exactly what I looked for.
Thank you so much you made my day...

  1 Comment

Cool. My pleasure. Please just accept my answer to close the case :-)

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Answer by SUDHEEP
on 30 Oct 2013

try this > a=2; >> b=4; >> bar(a) >> hold on >> bar(2,b,'r') >> axis([0 5 0 6])

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Answer by Dr. Murtaza Khan on 16 Mar 2019
Edited by Dr. Murtaza Khan on 16 Mar 2019

mydata=rand(1,10)
color= ['r','g','b','k'];
figure, hold on
% % if data is more than colors then colors will be repeated
m = length(color);
for k = 1:length(mydata)
i = mod(k-1,m); %%i is remainder after division of k-1 by m
i = i+1;
h=bar(k,mydata(k));
set(h,'FaceColor',color(i));
end

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