On 11-03-10 5:54 AM, Ivan Calandra wrote:
Try with double "== "instead:
ifelse(val3 == "Monthly", val<- val1, val<- val2)
That might work, but it is not how you should do it. (It should work if
val3 has a single entry, but will do strange things if val3 is a vector:
> val3 <- c("Monthly", "Daily")
> ifelse(val3 == "Monthly", val<- 1, val<- 2)
[1] 1 2
> val
[1] 2
The ifelse() function does a vectorized test, and picks results from the
two vector alternatives. Vincy wants a simple logical if, which can be
computed in a few different ways:
val <- if(val3 == "Monthly") val1 else val2
or
if (val3 == "Monthly") val <- val1
else val <- val2
For a simple calculation like this I'd probably use the former; if the
calculation got more complex I'd prefer the latter.
Duncan Murdoch
Single "=" is for setting arguments within a function call. If you want
to test equality, then double "==" is required.
See ?"=="
HTH,
Ivan
Le 3/10/2011 11:45, Vincy Pyne a écrit :
Dear R helpers
Suppose
val1 = c(10, 20, 35, 80, 12)
val2 = c(3, 8, 11, 7)
I want to select either val1 or val2 depending on value of third quantity val3.
val3 assumes either of the values "Monthly" or "Yearly".
If val3 = "Monthly", then val = val1 and if val3 = "Yearly", then val = val2.
I tried the ifelse statement as
ifelse(val3 = "Monthly", val = val1, val2)
I get following error
ifelse(val3 = "Monthly", val = val1, val2)
Error in ifelse(val3 = "Monthly", val = val1, val2) :
unused argument(s) (val3 = "Monthly", val = val1)
val
Error: object 'val' not found
Kindly guide.
Regards
Vincy
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