Let M be the matrix:
[,1] [,2]
[1,] 1 9
[2,] 3 12
[3,] 6 4
[4,] 7 2
I would like to extract all rows with entries equal to the components of the vector v <- c(3,6,1)
from column [,1] in M producing the submatrix m:
[,1] [,2]
[1,] 1 9
[2,] 3 12
[3,] 6 4
I tried
m <- M[which(M[,1] == v), ]
Obtaining the error message longer object length is not a multiple of shorter object length
. Using the transpose t(v)
of v
does not help.
using %in%
:
M[M[,1] %in% v,]
[,1] [,2]
[1,] 1 9
[2,] 3 12
[3,] 6 4
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