Hello Uwe
thanks for this. Unfortunately it doesn't quite do what I want:
R> x <- c(0.3,0.3,0.5) R> f(c("sin","cos"),1:2,x)
1] 1.266795 Warning messages: 1: longer object length is not a multiple of shorter object length in: x + int 2: number of rows of result is not a multiple of vector length (arg 1) in: cbind(foo, x + int) R>
[
I need
R> sin(x+1) + cos(x+2) [1] 0.2972822 0.2972822 0.1963514
]
best wishes
Robin
On May 9, 2005, at 08:34 am, Uwe Ligges wrote:
Robin Hankin wrote:
Hi I have an application where my difficulty boils down to not being able to define a function f() with the following properties: f("sin",0:2,x) #returns sin(x+0) + sin(x+1) + sin(x+2) f(c("sin","cos"), 1:2,x) #returns sin(x+1) + cos(x+2) f(c("sin","cos","exp"),3,x) #returns sin(x+3) + cos(x+3) + exp(x+3) anyone?
Not really nice, but hopefully works:
f <- function(foo, int, x){ # too lazy to think myself about recycling: X <- cbind(foo, x + int) # mapply-ing over both columns values <- mapply(function(foo, x) do.call(foo, list(x)), X[,1], as.integer(X[,2])) # caculating the sum: return(sum(values)) }
Uwe
-- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743
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