3 messages · White.Denis@epamail.epa.gov, Peter Dalgaard, John Janmaat
Try these: which.col <- function (mat, x) (which(mat==x)-1) %/% nrow(mat) + 1 which.row <- function (mat, x) (which(mat==x)-1) %% nrow(mat) + 1 Knowing the R community, there may be already functions to do this.
Is there a fast way to find the index(row and column) of a point in a matrix?
white.denis at epamail.epa.gov writes:
Try these: which.col <- function (mat, x) (which(mat==x)-1) %/% nrow(mat) + 1 which.row <- function (mat, x) (which(mat==x)-1) %% nrow(mat) + 1 Knowing the R community, there may be already functions to do this.
There is. Take another look at ?which.
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
Hello All, Thanks, John.
white.denis at epamail.epa.gov writes:
Try these: which.col <- function (mat, x) (which(mat==x)-1) %/% nrow(mat) + 1 which.row <- function (mat, x) (which(mat==x)-1) %% nrow(mat) + 1 Knowing the R community, there may be already functions to do this.
There is. Take another look at ?which.
-------------------------------------------------------------------------- Dr. John Janmaat Department of Economics, Acadia University, Wolfville, NS, B4P 2R6 E-mail: jjanmaat at acadiau.ca Web: http://ace.acadiau.ca/~jjanmaat Tel: 902-585-1461 Fax: 902-585-1070