putting error bars on bar plot?

Hello!

I have a mean of subjects bar plot, specifically a horizontal bar plot (barh), and I want to add error bars to the the bar plot and plot it against categorical data. I have calculated the STD:

values:

std = 34x1 double

mean = 34x1 double

x = 1x34 categorical

std = std(matrix, 0, 2)
barwitherr(std, 1:length(x), mean_matrix)

The plot runs, but doesn't add error bars.

I am getting the error:

Undefeined function barwitherr for input arguments of type double.

Can you help me?

Answer 1

[Star Strider]

I do not remember when ‘XEndPoints’ and ‘YEndPoints’ were introduced (and I am not able to find it in the documentation), so I included two options —

x = categorical({'a','b','c'});
y = [75.8 78.05; 81 80.30; 91 80.78];
err = rand(size(y))*10;

figure
b = bar(x,y);
hold on
for k = 1:numel(b)                                                      % Recent MATLAB Versions
    xtips = b(k).XEndPoints;
    ytips = b(k).YEndPoints;
    errorbar(xtips,ytips,err(:,k), '.g', 'MarkerSize',0.1)
end
hold off

figure
b = bar(y);
for k = 1:numel(b)                                                      % Earlier MATLAB Versions
    ctr(k,:) = bsxfun(@plus, b(k).XData, [b(k).XOffset]');
    ydt(k,:) = b(k).YData;
end
hold on
errorbar(ctr, ydt, err.', '.g', 'MarkerSize',0.1)
hold off
set(gca,'XTickLabel',x)

This is a general solution, using single or grouped bar plots, and adapts to the size of ‘y’. Choose the approach that works, depending on the available MATLAB version/release.

.

[nines]

thank you!

[Star Strider]

As always, my pleasure!

.