Re: [R] Return TRUE only for first match of values between matrix and vector.

Hi, This should be little more faster. indx - A==B indx1 - which(indx, arr.ind=TRUE) indx[indx1[duplicated(indx1[,1]),]]- FALSE indx ##Speed comparison ##previous method fun1 - function(mat, vec) {     stopifnot(dim(mat)[1] == length(vec))     indx - mat == vec     t(apply(indx, 1, function(x)

[R] Return TRUE only for first match of values between matrix and vector.

I wish to return True in a matrix for only the first match of a value per row where the value equals that in a vector with the same number of values as rosw in the matrix eg: A-matrix(c(2,3,2,1,1,2,NA,NA,NA,5,1,0,5,5,5),5,3) B-c(2,1,NA,1,5) desired result: [,1] [,2] [,3] [1,] TRUE FALSE

Re: [R] Return TRUE only for first match of values between matrix and vector.

Hi, Try: indx - A==B t(apply(indx,1,function(x) {x[duplicated(x) !is.na(x)] - FALSE; x})) #  [,1]  [,2]  [,3] #[1,]  TRUE FALSE FALSE #[2,] FALSE    NA FALSE #[3,]    NA    NA    NA #[4,]  TRUE    NA FALSE #[5,] FALSE  TRUE FALSE A.K. On Friday, May 2, 2014 4:47 AM, nevil amos

Re: [R] Return TRUE only for first match of values between matrix and vector.

Hi Nevil, Try apply(A, 2, function(x) x == B) HTH, Jorge.- On Fri, May 2, 2014 at 6:46 PM, nevil amos nevil.a...@gmail.com wrote: I wish to return True in a matrix for only the first match of a value per row where the value equals that in a vector with the same number of values as rosw