r - Sorting a Square Matrix -

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i have 75 x 75 square matrix. values in it, other labels decimals. want pairs of labels having values above or below cutoff set. say, have following

         b     c     d    1     0.2   0.43  0.16 b    0.2   1     0.86  0.28 c    0.43  0.86  1     0.76 d    0.16  0.28  0.76  1

i want

b   c   0.86 c   d   0.76   c   0.43

how can go (without getting duplicates)?

thanks

first need convert representation 1 row each value; 1 way converting matrix , data.frame. avoid duplicates, set lower triangle (possibly including diagonal) na before converting data frame, , take subset of data frame values aren't nas.

mtx <- matrix( rnorm(16), 4, 4, dimnames = list( letters[1:4], letters[1:4])) mtx[lower.tri(mtx, diag=true)] <- na dx <- as.data.frame(as.table(mtx)) dx <- subset(dx, !is.na(freq))

you can take subset desired resulting data frame.

> subset(dx, freq>0)    var1 var2      freq 5        b 1.9564158 9        c 1.7188939 14    b    d 0.1848542

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