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How to add error bars to a bar graph

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Hey, so I have 4 sets of data for which I obtained the mean for each and then created a bar graph. I also used the std command to obtain the standard deviation of each set of data, not sure if that is correct but I wish to create error bars. Here is my code and graph
static_cisplatin=[0.515, 0.453, 0.448, 0.437, 0.344, 0.352, 0.336, 0.318];
static_without=[1.083, 1.419, 1.256, 1.3, 1.612, 1.374, 1.353, 1.354];
spin_cisplatin=[0.342, 0.306, 0.268, 0.312, 0.278, 0.29, 0.267, 0.267];
spin_without=[0.909, 0.964, 0.857, 0.76, 1.095, 0.993, 0.642, 0.418];
A=mean(static_cisplatin);
B=mean(static_without);
C=mean(spin_cisplatin);
D=mean(spin_without);
S1=std(static_cisplatin);
S2=std(static_without);
S3=std(spin_cisplatin);
S4=std(spin_without);
x_axis= categorical({'static cisplatin','static without',...
'spin cisplatin', 'spin without'});
y_axis= [A B C D];
bar(x_axis,y_axis, 0.4)

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