[R] outer() function
Kyle LaMalfa
kylelamalfa at gmail.com
Thu Mar 23 21:56:59 CET 2006
Greetings R-help community,
I am relatively new to R, which may be why I am having trouble
understanding this problem. I am trying to use outer() to generate a
graphable surface of a function. If there is a better way to do this,
I would appreciate the insight. Otherwise, could someone suggest a
method to get the outer() function to work here?
Below is my simplified R program. Further down is the output.
Thanks in advance,
Kyle
###################
data <- c(0, 1, 2, 3)
x <- c(0,2,4)
y <- c(0,1,2)
f <- function(x, y) sum(data*x)+y
f(0,0); f(2,0); f(4,0);
f(0,1); f(2,1); f(4,1);
f(0,2); f(2,2); f(4,2);
outer(x, y, f)
f <- function(x, y) x-x+y-y+force(sum(data^x))
outer(x, y, f)
##################################
> data <- c(0, 1, 2, 3)
> x <- c(0,2,4)
> y <- c(0,1,2)
>
> f <- function(x, y) sum(data*x)+y
> f(0,0); f(2,0); f(4,0);
[1] 0
[1] 12
[1] 24
> f(0,1); f(2,1); f(4,1);
[1] 1
[1] 13
[1] 25
> f(0,2); f(2,2); f(4,2);
[1] 2
[1] 14
[1] 26
> outer(x, y, f)
[,1] [,2] [,3]
[1,] 20 21 22
[2,] 20 21 22
[3,] 20 21 22
Warning message:
longer object length
is not a multiple of shorter object length in: data * x
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