Think about what i-1 would be the first time though the loop. R
doesn't like 0 as an index. You are going to need to decide what you
consider to the the "previous value" for the first element in your
vector.
If you want cumulative sums, then look at the function cumsum
?cumsum
On Apr 7, 2009, at 8:13 AM, Melissa2k9 wrote:
Hi,
I am trying to make a sequence and am using a for loop for this. I
want to
start off with an initial value ie S[0]=0 then use the loop to
create other
values. This is what I have so far but I just keep getting error
messages.
#To calculate the culmulative sums:
s<-rep(0,207) #as this is the length
of the
vector I know I will have
s<-as.vector(s)
s[0]<-0
for (i in 1:length(lambs)) # where lambs is a
vector of
length 207 consisting of temperature
values
{
s[i]<-s[i-1]-mean(lambs)
}
I continually get the error message:
Error in s[i] <- s[i - 1] - mean(lambs) : replacement has length zero
When I merely use s[i]<-i-mean(lambs) it works so there is obviously
something wrong with the s[i-1] but i cant see what. All I want is
for each
S[i] to be the previous value for S - the mean!
--
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http://www.nabble.com/Sequences-tp22927714p22927714.html
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