[R] Letter-based representation of pairwise comparisons

[goz]

hello,

i try to use the multcomp letters, but i have problems with my results : 

here is my pvalue matrix (from a pairwise.t.test) : 

pair=pairwise.t.test(...)
pair$p.value

        0           B            BxS    
B    0.01727    -             -      
BxS 0.00013    0.00226   -      
S    0.87555    0.02610   0.00027


i was thiking to have something like that : 
 0  B  S  BxS
 a  b  a  c

but function return : 

> multcompLetters(pair$p.value)
  B   BxS   S 
 "a"  "b"   "a" 


first question : why the 0 traitement doesn't appears in result ?
second  : why the results differs than what i expected ?

many thanks.

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