R help - Mar 2005 - Ploting a function of two arguments

Hi,

I've written a function:

myfun <- function(x, y) {
   // blah blah
}

and I want to graph it.  My plan is to use persp(), and my question is: 
how do I create the array of values?  One possibility is:

x <- seq(0, 10, by=.1)
y <- seq(0, 10, by=.1)

inputs <- <somehow create an array of x,y pairs>

outputs <- apply(A, c(1,2), myfun)

The "inputs" array would need to be 101x101x2 array, i.e. basically a
2D
array of pairs.  I might need to write a little wrapper for myfun.

Am I on the right track, or is there an easier way to do this?  It seems 
there should be an easier way to graph a 2 argument function like this.

- Martin

There are at least two options:

1. Use outer(); e.g., something like z <- outer(x, y, f).

2. Use expand.grid(x, y), then call f() with the output.

Andy
> From: Martin C. Martin
> 
> Hi,
> 
> I've written a function:
> 
> myfun <- function(x, y) {
>    // blah blah
> }
> 
> and I want to graph it.  My plan is to use persp(), and my 
> question is: 
> how do I create the array of values?  One possibility is:
> 
> x <- seq(0, 10, by=.1)
> y <- seq(0, 10, by=.1)
> 
> inputs <- <somehow create an array of x,y pairs>
> 
> outputs <- apply(A, c(1,2), myfun)
> 
> The "inputs" array would need to be 101x101x2 array, i.e. 
> basically a 2D 
> array of pairs.  I might need to write a little wrapper for myfun.
> 
> Am I on the right track, or is there an easier way to do 
> this?  It seems 
> there should be an easier way to graph a 2 argument function 
> like this.
> 
> - Martin
> 
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