[R] Applying function to multiple input vectors

[Adaikalavan Ramasamy]

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.
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