Dear list members,
I'm quite new to R, and though I tried to find the answer to my probably
very basic question through the available resources (website, mailing
list archives, docs, google), I've not found it.
If I try to use the integrate function from within my own functions,
my functions
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of theo borm
Sent: Friday, February 23, 2007 1:43 PM
To: r-help@stat.math.ethz.ch
Subject: [R] using integrate in a function definition
Dear list members,
I'm quite new to R
theo borm wrote:
jjj-function(www) {2*integrate(dnorm,0,www)$value}
kkk-function(www) {2*(pnorm(www)-0.5)}
xxx-seq(0:5)
yyy-jjj(xxx)
zzz-kkk(xxx)
produces no errors, but:
yyy
[1] 0.6826895
zzz
[1] 0.6826895 0.9544997 0.9973002 0.367 0.994 1.000
Why is this?
Ravi Varadhan wrote:
Your function jjj is not vectorized.
Try this:
jjj - function(www) sapply(www, function(x)2*integrate(dnorm,0,x)$value)
plot(jjj, 0, 5)
It should work.
Yes it does. Thanks!
Thinking of it, it now starts to make some sort of sense that integrate
should return a
Hi,
Many thanks for the explanation.
Alberto Monteiro wrote:
PS: fff - function(x) 1
integrate(fff, 0, 1) # error. why?
Guess: because integrate itself expects a vectorized function ?
fff(1:5)
[1] 1
ggg-function(x) { sapply(x, function(x)1) }
ggg(1:5)
[1] 1 1 1 1 1
