I am discovering sapply! :-) Could you please help me with a very
elementary question?
Here is what I know. The following two programs generate the same answer.
--------------------------------+----------------------------------------
Loops version | sapply version
--------------------------------+----------------------------------------
|
f <- function(x) { | f <- function(x) {
return(x*x) | return(x*x)
} | }
values = c(2,4,8) | values = c(2,4,8)
answers=numeric(3) | answers = sapply(values, f)
for (i in 1:3) { |
answers[i] = f(values[i]) |
} |
and this is cool!
My problem is this. Suppose I have:
pythagorean <- function(x, y) {
return(x*x + y*y)
}
then how do I utilise sapply to replace
fixed.x = 3
y.values = c(3,4,5)
answers=numeric(3)
for (i in 1:3) {
answers[i] = pythagorean(fixed.x, y.values[i])
}
?
I have read the sapply docs, and don't know how to tell him that the
list values that he'll iterate over "fit in" as y.values[i].
--
Ajay Shah Consultant
[EMAIL PROTECTED] Department of Economic Affairs
http://www.mayin.org/ajayshah Ministry of Finance, New Delhi
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