[R] ifelse question

[Leeds, Mark (IED)]

ifelse is vectorized but there is no way you could know what's
happening with that command
 because you have rnorm(1) for both conditions. I think you mean to have
something different in one of them ?

Whewn I run your code in my R session, I get 10 values for y1, so there
isn't anything wrong except
That you have the same statement for both cases.




-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of
jropers at freesurf.fr
Sent: Tuesday, December 12, 2006 3:13 PM
To: r-help at stat.math.ethz.ch
Subject: [R] ifelse question

Dear R-helpers,
How come that in the following code the rnorm() function is evaluated
only once for each branch of the 'ifelse' ? 

x <- rnorm(10)
y1 <- ifelse(x > 0, rnorm(1) ,  rnorm(1))


What is the right way to make it called/evaluated for each row, apart
from a 'for' loop ?

Thanks, 

Jacques.

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