my_ph_letters( cmat ) updated version >>> 1.20 <<<

Means with letters after a multiple comparison test.

Create letters to separate means after a multiple comparison test.
Usage:
o = my_ph_letters( cmat )

CMAT arises from MULTCOMPARE in Statistic Toolbox

Example:
For 3 treatments and 4 replications.
ANOVA, post-hoc with MULTCOMPARE using HSD Tukey
at 5% significance level, and grouping.

x = meshgrid(1:3,1:4);
rng default; % For reproducibility
x = x + normrnd(0,1,4,3)
[p,t,s] = anova1(x);
[c,m,h,gnames] = multcompare(s,'alpha',0.05,'ctype','hsd');
grp = my_ph_letters(c)

x =

1.7254 1.8759 3.6715
0.9369 3.4897 1.7925
1.7147 3.4090 3.7172
0.7950 3.4172 4.6302

grp =

'a' 'ab' 'b'