Add error bars to grouped bar plot

I have a simple, grouped bar plot. I want to add error bars, but I can't seem to figure out how to do it. I've tried the errorbar function, but I think I'm missing something.

I'm not really great with for loops, but I was wondering if that would be easier? Not sure how to build one when plotting, though.

Here's my code and graph:

% Plot raw data
x = 1:6
y = [316.45 292.14 319.96; 305.59 287.99 295.21]  
err = [13.12 5.67 12.36; 12.43 6.83 11.67]

box on

bar(y)
set(gca,'xticklabel',{'Pre-test'; 'Post-test'}) 
ylim([200 360])
ylabel('RT (ms)')
xlabel('Session')

Answer 1

[Jeremy]

Like this?

https://www.mathworks.com/help/matlab/creating_plots/bar-chart-with-error-bars.html

[michelle bruni]

Yes, except I don't know what to put for x=? Because it's grouped, I don't know how to indicate that there are 3 bars per tick (pre-test and post-test).

Answer 2

[Star Strider]

See: Adding standard error bars to grouped bar graph