MATLAB: How to creat two box plot in one graph use different data

Question

a=[9 3 5 3 0 10 6 8 4 9 7 3 8 6 6 9 1 8 8 6 10]

b=[10 7 5 6 8 6 4 7 8 8 9 7 10 7 6 6 7 2 8 10 8]

this is the two group number.

Answer 1

One way is to use a "grouping variable" as the second argument:

a=[9 3 5 3 0 10 6 8 4 9 7 3 8 6 6 9 1 8 8 6 10];
b=[10 7 5 6 8 6 4 7 8 8 9 7 10 7 6 6 7 2 8 10 8];
ag =   ones(size(a));
bg = 2*ones(size(b));
figure
boxplot([a b]',[ag bg]')
set(gca,'XTickLabel',{'a','b'})