[R] matrix element position: from length to dim

Ana rrasterr at gmail.com
Thu Feb 2 14:08:37 CET 2012


How can I pass from position in length inside a matrix to position in dim ?


a=matrix(c(1:999),nrow=9)

which(a==87)    #position in length 1:length(a)
87

which(a==87,arr.ind=TRUE)   #position in dim
     row col
[1,]   6  10



More information about the R-help mailing list