On Apr 10, 2012, at 1:08 PM, Steve Lavrenz wrote:
I definitely need a loop - the example I gave was only a simple one.
Say I
want to do more complex calculations in each step, such that the
numeric
difference between consecutive terms is not constant.
You can always use:
for( i in seq(0,100, by=5) ){
....stuff... }
seq_along() creates an integer index from a vector. It avoids potenial
problems with
for( i in 1:length(vec) ) { }
-Steve
From: Jean V Adams [mailto:jvad...@usgs.gov]
Sent: Tuesday, April 10, 2012 12:38 PM
To: Steve Lavrenz
Cc: r-help@r-project.org
Subject: Re: [R] Creating a loop with an indefinite end term
Do you need a loop at all?
Will this do the trick?
seq(from=0, to=100, by=5)
Jean
Steve Lavrenz wrote on 04/10/2012 09:48:34 AM:
Everyone,
I'm very new to R, especially when it comes to loops and functions,
so
please bear with me if this is an elementary question. I cannot
seem to
figure out how to construct a loop which runs a function until a
certain
value is computed. For example, say I have the following:
num = numeric (10)
num [1] = 0
for (i in 2:10) {
num [i] = num [i-1] + 5
}
This adds 5 to the preceding spot of a vector of length 10 to get the
value
in the current spot. However, say I don't just want to run this for
10
spots; rather I want to run it until a certain value (say, 100) is
computed.
How I construct my loop to do this?
Thanks!
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