How to add error bars to a bar graph

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)

Answer 1

[Star Strider]

See: error bars in bar plot with categories for one example.