Message-ID: <42824226.2060303@lancaster.ac.uk>
Date: 2005-05-11T17:34:30Z
From: Barry Rowlingson
Subject: simplify loop
In-Reply-To: <3f87cc6d05051110054d65813a@mail.gmail.com>
Omar Lakkis wrote:
> Is there a way to implement this faster than doing it in a loop.
>
> for (i in length(settle)-1:1) {
> settle[i] = settle[i+1]/(1 + settle.pct[i+1])
> }
You dont need a loop at all here. How so? Well, as it is written the
code in the for loop only executes once:
> settle=1:10
> for (i in length(settle)-1:1) {
+ print(i)
+ }
[1] 9
>
you have made a mistake, and I think you really want:
> for (i in (length(settle)-1):1 ) {
since R does the ':' first and then does 'length(settle)-' unless you
bracket it:
> length(settle)-1:1
[1] 9
> (length(settle)-1):1
[1] 9 8 7 6 5 4 3 2 1
I don't see an obvious way to get rid of the for loop though...
Baz