Hi.
Say I have a function f with two inputs, x and y
f <- function(x,y) {something}
that I wish to evaluate with two input vectors of length N
X <- c(x1, x2, ..., xN)
Y <- c(y1, y2, ..., yN)
to obtain the length-N output vector c( f(x1,y1), f(x2,y2), ...,
f(xN,yN) ).
Is there a method analogous to sapply() for this operation?
Yours truly,
Ronnen.
P.S. E-mailed CCs of posted replies appreciated.
> Is there a method analogous to sapply() for this operation?Check out mapply. Hadley
Adaikalavan Ramasamy
2005-Mar-28 10:04 UTC
[R] Applying function to multiple input vectors
set.seed(1) xx <- sample( 1:10 ) xx [1] 3 4 5 7 2 8 9 6 10 1 yy <- sample( 1:10 ) yy [1] 3 2 6 10 5 7 8 4 1 9 (xx + yy)^2 [1] 36 36 121 289 49 225 289 100 121 100 myfun <- function(x, y) ( x + y )^2 mapply( myfun, xx, yy ) [1] 36 36 121 289 49 225 289 100 121 100 diag( outer( xx, yy, FUN=myfun) ) [1] 36 36 121 289 49 225 289 100 121 100 Regards, Adai On Sun, 2005-03-27 at 15:38 -0800, Ronnen Levinson wrote:> Hi. > Say I have a function f with two inputs, x and y > > f <- function(x,y) {something} > > that I wish to evaluate with two input vectors of length N > > X <- c(x1, x2, ..., xN) > Y <- c(y1, y2, ..., yN) > > to obtain the length-N output vector c( f(x1,y1), f(x2,y2), ..., > f(xN,yN) ). > Is there a method analogous to sapply() for this operation? > Yours truly, > Ronnen. > P.S. E-mailed CCs of posted replies appreciated. > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >