Re: [R] algorithm to merge same entries in a matrix

Hi, Take a look at the rle() function. This finds runs of equal values in vectors. Using apply this can quite easily be run for all the rows/columns of a matrix. cheers, Paul On 08/30/2011 04:58 PM, Martin Batholdy wrote: > Hi, > > I have the following, rather unorthodox problem: > > > I have a

[R] algorithm to merge same entries in a matrix

Hi, I have the following, rather unorthodox problem: I have a matrix that looks like this: m1 <- matrix(c('a','b','d',NA,'c','c'), 2,3, byrow=TRUE) [,1] [,2] [,3] [1,] "a" "b" "d" [2,] NA "c" "c" now I would like to transform this matrix into this matrix: [,1] [,2]