Rolling average length issue

Hi Sandy,

Why don't you usw runmean() of the caTools package??
In the see also section of the help for runmean() there are various  
other possibilities given.

Good Luck
Gerald

??????
3rd Law of Computing:
   Anything that can go wr
fortune: Segmentation violation -- Core dumped


Am 06.11.2010 um 02:44 schrieb David Winsemius:

On Nov 5, 2010, at 12:03 PM, Sandy Zelka wrote:

Please help....I'm trying to calculate a 5-point rolling average  
and I keep getting a length issue.
My script is

Not a SIG-Mac issue.

ma5<-function (x){
y<-numeric(length(x-2)
for(i in 2(length(x)-1)){

You seem to missing an operator between 2 and (, and I am guessing  
you meant to type "*" or ":") but it is not clear SINCE YOU HAVE  
NOT DESCRIBED THE PROBLEM WELL. (And you have not posted the exact  
error message either.)

Also check FAQ for description of problems related to the hierarchy  
of arithmetic operators in R (I don't actually remember a FAQ  
nubmber for this one but it is "frequently asked":

x <- 1:10
2:length(x) -1

[1] 1 2 3 4 5 6 7 8 9

y[i]]<-(x[i-3]+x[i-2]+x[i-1]+x[i]+x[i+1]))/5

So have you checked at the ends of your ranges to see if these  
indices are meaningful? What is length(x) and would it be  
meaningful to request x[2-1 -3]? What is x[-2]  (or perhaps  
x[1-3] ) , after all? Or x[length(x)

}
Y}

I keep getting a replacement has length zero
I?ve tried changing the (x-2) to -3 and -4 and still get the same  
issue.

More likely that the extremes would raise "out of range" problems  
than the "interior" indices.

I?m thinking that it should be -2 and that this issue is in the  
third line ? any ideas?

Better problem description, better punctuation,  and posting to  
rhelp.


-- 
David.

Sandy Zelka, CPA, CAE, MBA, LB
Accounting Professor
(518) 469-8040


		 	   		
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David Winsemius, MD
West Hartford, CT