x1 = rand(5,1);
x2 = rand(10,1);
x3 = rand(15,1);
x = [x1; x2; x3];
g1 = repmat({'First'},5,1);
g2 = repmat({'Second'},10,1);
g3 = repmat({'Third'},15,1);
g = [g1; g2; g3];
boxplot(x,g)
qx1 = quantile(x1, [.25 .5 .75]);
qx2 = quantile(x2, [.25 .5 .75]);
qx3 = quantile(x3, [.25 .5 .75]);
hold on
text(1+.25+zeros(1,3), qx1, string(qx1), 'HorizontalAlignment', 'left');
text(2+.25+zeros(1,3), qx2, string(qx2), 'HorizontalAlignment', 'left');
text(3+.25+zeros(1,3), qx3, string(qx3), 'HorizontalAlignment', 'left');
