MATLAB: How to put error bars on top of grouped bars

bar grapherror barindividual error barMATLABundocumented

Best Answer

A few tweaks of your code Assuming R2014b or later):
y1 = [2.194  2.145  2.126  2.115
2.01  2.098  2.136  2.136
2.1  2.105  2.111  2.115
2.155  2.133  2.187  2.192];
err1=[0.002  0.004  0.011  0.005
  0.019  0.006  0.003  0.008
  0.008  0.007  0.011  0.007
  0.013  0.016  0.013  0.019];
hBar = bar(y1,1);                                                   % Return ‘bar’ Handle
for k1 = 1:size(y1,1)
    ctr(k1,:) = bsxfun(@plus, hBar(1).XData, hBar(k1).XOffset');    % Note: ‘XOffset’ Is An Undocumented Feature; This Selects The ‘bar’ Centres
    ydt(k1,:) = hBar(k1).YData;                                     % Individual Bar Heights
end
hold on
errorbar(ctr, ydt, err1, '.r')                                      % Plot Error Bars
hold off
ylim ([1.8 2.4])
title('Hardened density')
grid on 
grid minor
legend ('CON','MK20','nS1','nC1','location','NW')
xlabel('Mortar Type') % x-axis label
ylabel('Density (g/m^3)') % y-axis label
set(gca,'XTickLabel',{'NF','SFI','SFII','SC-M'})
produces:
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