multcompLetters错过了一个比较

Question

当我从multcompLetters包中执行multcompview时。缺少一个比较（就我而言）。

h <- structure(c(4.91705503037395e-27, 7.39556093715795e-33, NA, 4.75683170514963e-07
), .Dim = c(2L, 2L), .Dimnames = list(c("t14", "t29"), c("t0", 
"t14")))

h
              t0          t14
t14 4.917055e-27           NA
t29 7.395561e-33 4.756832e-07

library(multcompview)
 q <- multcompLetters(h, threshold = 0.05)
 q
t14 t29 
"a" "b"