Eric Turkheimer 写道:
I am wondering if it is possible to perform the following two basic
functions with primitive R functions. I know I could write functions for
either, but it seems as though they are probably built-in somewhere.
1) Fill out a vector to a desired length with missing values or zeros. So,
x<-c(3,4,5)
f(x,5)
3,4,5,NA,NA
Dunno if any buildin function in R, but c(x,rep(NA,5-length(x))) seems
to be simple
2) Find the [row,col] location of a particular value in a matrix, eg
x<-matrix(1:9,ncol=3)
f(x,2)
2,1
which(2==x,arr.ind=T)
Thanks.
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