Like this?
X = randn(100,82);
boxplot(X)
xt = 20:20:80;
set(gca,'XTick',xt,'XTickLabel',xt);
Or like this?
xt = 20:20:80;
boxplot(X(:,xt))
set(gca,'XTickLabel',xt);
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!