On 3/20/2013 8:21 AM, PIKAL Petr wrote:
Hi
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
project.org] On Behalf Of Andras Farkas
Sent: Wednesday, March 20, 2013 2:11 PM
To: r-help@r-project.org
Subject: [R] how to skip part of the code
Dear All,
another quick question, this one is on skipping part of my code, so let
us say:
a <-5
b <-2
e <-0
d <-a+b
f <-a-b
what I would like to do is to have R NOT to calculate the value for d
in case the value of e equals to zero (essentially skip that "chunk"),
but instead move on to calculate te value for f. In the code I am
working with the value of e changes, and I would like to calculate d
and f at all times when the value of e is greater then zero. If
possible, I would like to do this without using the functions "ifelse"
and "if else"
Why? This is exactly the reason for which if else was invented?
I am not sure if some simple solution without if is available.
if (e > 0) { d <- a+b; f <- a-b }
seems to be simple.
Regards
Petr
I second Petr on the question, why not use if? But this might meet your
criteria.
a <- 5
b <- 2
e <- 0
#
dat <- data.frame(a, b, e)
dat$d[dat$e > 0] <- a + b
dat$f <- a - b
appreciate the help,
Andras
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Professor of Physiology
Kirksille College of Osteopathic Medicine
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