MATLAB: Bar plot with error bar

column plotMATLABplot

I have to plot bar plots with error bars but the error bars. For example

      A  10(4-18)
      B  21(11-28)
      C  32(19-37)

A, B and C are to be plotted as bars with the center value (not in parenthesis). The values in parenthesis are the lower and upper limits of the whiskers to be represented as errors on the bar plot. Thank You

Best Answer

Here's a demo using your data.

count = [10, 21, 32]; 
errLim = [4, 11, 19; 18, 28, 37]; 
err  = errLim - count; 
figure;
bar(count)
hold on
errorbar(1:length(count), [10, 21, 32], err(1,:), err(2,:), 'LineStyle','none')
set(gca, 'xtick', 1:length(count), 'xticklabel', {'A' 'B' 'C'})

Related Solutions

MATLAB: Add error bars in bar graph

Here's a demo you can follow to add error bars to a grouped bar chart.

To center the errorbar on each bar, you need to compute their center points along the x axis. That is done using an undocumented property XOffset explained here.

Required inputs are

count: an n x m matrix that will produce n groups each containing m bars.
err: an n x m matrix that defines the error for each bar

% Create bar data

count = [9862.5 5238 3845.2; 9368.6 3515 3625.7; 11064 6810 4073.6; 12599.2 5701 3955.3; 10114.4 5683 3664.5]; 
% Create error data (using random data for this demo)
err  = (rand(size(count))+2)*100; 
% Plot bars
figure;
h = bar(count);
% Get x centers; XOffset is undocumented
xCnt = (get(h(1),'XData') + cell2mat(get(h,'XOffset'))).'; 
% Add errorbars
hold on
errorbar(xCnt(:), count(:), err(:), err(:), 'k', 'LineStyle','none')
% or
% errorbar(xCnt(:), count(:), err(:), 'LineStyle','none')

Alternatively, if you're working with error intervals that define the upper and lower bounds of error,

Required inputs are

count: an n x m matrix that will produce n groups each containing m bars.
errUpperBound: an n x m matrix that defines the upper bound of error for each bar
errLowerBound: an n x m matrix that defines the lower bound of error for each bar

% Create bar data
count = [9862.5 5238 3845.2; 9368.6 3515 3625.7; 11064 6810 4073.6; 12599.2 5701 3955.3; 10114.4 5683 3664.5]; 
% Create upper and lower error bounds
errUpperBound = count + 200; 
errLowerBound = count - 100; 
% Compute the error distance in the neg & pos directions
errNeg = count - errLowerBound; 
errPos = errUpperBound - count; 
% plot error bar
errorbar(xCnt(:), count(:), errNeg(:), errPos(:), 'k', 'LineStyle','none')

MATLAB: Adding error bars to a grouped bar plot

The ability to specify that the "errorbar" function display the error bars inside the individual bars is not available in MATLAB. It displays errorbar at the center of each group.

To work around this issue, find the center of each bar and pass this data into "errorbar" with the respective error values.

ngroups = size(y, 1);
nbars = size(y, 2);
% Calculating the width for each bar group
groupwidth = min(0.8, nbars/(nbars + 1.5));
for i = 1:nbars
    x = (1:ngroups) - groupwidth/2 + (2*i-1) * groupwidth / (2*nbars);
    errorbar(x, y(:,i), err(:,i), '.');
end
hold off

Best Answer

Related Solutions

MATLAB: Add error bars in bar graph

MATLAB: Adding error bars to a grouped bar plot

Related Question