R help - Jan 2010 - Counting Na values on a time serie only on the past datas

Hello everyone, I have a time serie of n values, some are na's. I want to
get
a vector of size n whose elements represent on the time t < n the number of
missing values between o and t. I know I can do it with a loop but I wanted
to know if there was a function or a special syntax to do this. Thanks a
lot!
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> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of anna
> Sent: Friday, January 22, 2010 8:56 AM
> To: r-help at r-project.org
> Subject: [R] Counting Na values on a time serie only on the past datas
> 
> 
> Hello everyone, I have a time serie of n values, some are 
> na's. I want to get
> a vector of size n whose elements represent on the time t < n 
> the number of
> missing values between o and t. I know I can do it with a 
> loop but I wanted
> to know if there was a function or a special syntax to do 
> this. Thanks a
> lot!
If x is your vector of numbers then
   cumsum(is.na(x))
should give what you want.  You didn't
show sample data so here is my example
   > x <- c(101,102,NA,104,NA)
   > cumsum(is.na(x))
   [1] 0 0 1 1 2

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 
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William thanks a lot that is exactly what I wanted! :working:
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