From: Arun Kumar Saha <arun.kumar.saha_at_gmail.com>

Date: Sun, 06 Jul 2008 21:28:46 +0530

R-help_at_r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sun 06 Jul 2008 - 16:03:09 GMT

Date: Sun, 06 Jul 2008 21:28:46 +0530

I am not sure whether I could understand all things. Here is my code :

library(zoo)

# an reproducible example

SD <- 1

date1 <- seq(as.Date("2001-01-01"), as.Date("2002-12-1"), by = "day")
len1 <- length(date1)

set.seed(1) # to make it reproducible

data1 <- zoo(rnorm(len1), date1)

plot(data1)

# calculation for monthly or quarterly mean calc = function(frequ = c("M S", "Q S"))

{ switch(frequ "M S" = aggregate(data1, as.yearmon, mean) "Q S" = aggregate(data1, as.yearqtr, mean)) }

However I am getting lot of errors while executing. Any further suggestion?

Regards,

On Sun, Jul 6, 2008 at 3:38 PM, <ctu_at_bigred.unl.edu> wrote:

> Why don't you try "switch" Let me assume that you want to calculate a=3 and

*> b =5 by using one of "MEAN", "SUM","MIN", and "MAX functions. Then you could
**> write your code: (If you want to calculate "MEAN")
**>
**> example<-function(fun=c("MEAN", "SUM", "MIN", "MAX")){
**>>
**> + fun<-match.arg(fun);a=3;b=5
**> + switch( fun,
**> + MEAN=(a+b)/2,
**> + SUM=a+b,
**> + MIN=min(a,b),
**> + MAX=max(a,b))
**> + }
**>
**>> example("MEAN")
**>>
**> [1] 4
**>
**>>
**>> Hope this is helpful,
**> Chunhao Tu
**>
**>
**>
**>
**>
**>
**> Quoting Arun Kumar Saha <arun.kumar.saha_at_gmail.com>:
**>
**> There is "if-else" loop if I have to choose 1 item from a 2-item list.
**>> However if I have a list of 4 items (let say) then how i can choose a
**>> single
**>> item without employing 'if-else' loop? I mean in VBA I can use
**>> "select-case", is there any equivalent in R as well?
**>>
**>> Regards,
**>>
**>> [[alternative HTML version deleted]]
**>>
**>> ______________________________________________
**>> R-help_at_r-project.org mailing list
**>> https://stat.ethz.ch/mailman/listinfo/r-help
**>> PLEASE do read the posting guide
**>> http://www.R-project.org/posting-guide.html
**>> and provide commented, minimal, self-contained, reproducible code.
**>>
**>>
**>
**>
**>
*

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