Selecting unique rows in matrix using R [duplicate]

Answer 1

You can use the unique function:

unique(mat$V1) # and not matrix$v1
[1]   44  281 1312

You can also write

unique(mat)

and it will give you unique lines (I tried it on your file).

If you want to select on V1s values, you can do this:

> mat[!duplicated(mat$V1), ]
       X   V1 V2 V3 V4  V5 V6 V7 V8 V9 V10
1   1547   44 14  1  2 100 17  0  0  0   0
23  5385  281 67  2 10 100 10  0  0  0   0
33 17347 1312  1  2  6 100  8  0  0  0   0