Dear all,
Happy new year!
I have a question re using sapply. Below is a dummy example that would
replicate the error I saw.
##Code Starts here
DummyFunc <- function(x) {
if (x > 0) {
return (x)
} else
{
return (-x)
}
}
Y = data.frame(val = c(-3:7))
sapply(Y, FUN = DummyFunc)
##Code ends here
When I run it, I got:
val
[1,] 3
[2,] 2
[3,] 1
[4,] 0
[5,] -1
[6,] -2
[7,] -3
[8,] -4
[9,] -5
[10,] -6
[11,] -7
Warning message:
In if (x > 0) { :
the condition has length > 1 and only the first element will be used
The result is different from what I would expect plus there is such an error
message.
I guess if the DummyFunc I provided is compatible with vectors, the problem
would go away. But let's suppose I cannot change DummyFunc. Is there still a
way to use sapply or alike without actually writing a loop? Thanks.
- Alex
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