[R] Execute a function

[Peter Ehlers]

On 2012-07-20 04:05, carla moreira wrote:
>
> Hi,
>
> I would like to evaluate a function, with 3 arguments, for instance,
>
> myfunc<-function(a,b,c) { sqrt(a)-exp(b)+4*c
>                                                  }
>
> How to execute  myfunc(x,y,z), for all x, all y and all z, where x,y,z are
> vectors?

Is this what you have in mind:

   myfunc <- function(a, b, c){ sqrt(a)-exp(b)+4*c }
   myfunc2 <- function(x){
     a <- x[1]
     b <- x[2]
     c <- x[3]
     myfunc(a, b, c)
   }

   x <- c(1, 4, 9)
   y <- 1:2
   z <- c(10, -10, 2, 20)
   d <- expand.grid(x, y, z)
   d$value <- apply(d, 1, myfunc2)

?

Peter Ehlers

>
> Thank you very much in advance
>
>
>
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