Keep part of vector or matrix
Extract elements from a vector or matrix.
wkeep(x, l, opt = "centered")
x |
input data, specified as a numeric vector or matrix. |
l |
either a positive integer value, specifying the length to extract
from the input *vector* |
opt |
One of:
See the examples. Default: "centered". |
extracted vector or matrix
Sylvain Pelissier, sylvain.pelissier@gmail.com.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
## create a vector x <- 1:10 ## Extract a vector of length 6 from the central part of x. y <- wkeep(x, 6, 'c') ## Extract two vectors of length 6, one from the left part of x, and the ## other from the right part of x. y <- wkeep(x, 6, 'l') y <- wkeep(x, 6, 'r') ## Create a 5-by-5 matrix. x <- matrix(round(runif(25, 0, 25)), 5, 5) ## Extract a 3-by-2 matrix from the center of x y <- wkeep(x, c(3, 2)) ## Extract from x the 2-by-4 submatrix starting at x[3, 1]. y <- wkeep(x, c(2, 4), c(3, 1))
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