Hi
Bill Cunliffe wrote:
For example, based on a certain condition, I may want to exit my code early:
# Are there the same number of assets in "prices" and
"positions"?
if (nAssetPositions != nAssetPrices) {
cat("Different number of assets! \n\n")
<exit function>
}
I think the easiest thing to use is the 'stopifnot()' function.
afunction <- function(myinput) {
stopifnot(is.numeric(myinput))
return(myinput * 2)
}
Alternatively, you can also do:
afunction2 <- function(myinput) {
if (!is.numeric(myinput)) stop("Input not numeric")
return(myinput * 2)
}
> afunction("roland")
Error: is.numeric(myinput) is not TRUE
> afunction2("roland")
Error in afunction2("roland") : Input not numeric
> afunction2(123)
[1] 246
> afunction(123)
[1] 246
>
I hope this helps,
Roland
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