[R] is.na with lists....

[akshay kulkarni]

Dear AVi,
                 Thanks ....got to know the difference...should have used sum() instead of length()...

Yours sincerely,
AKSHAY M KULKARNI
________________________________
From: Avi Gross <avigross using verizon.net>
Sent: Saturday, July 2, 2022 11:47 PM
To: akwsimmo using gmail.com <akwsimmo using gmail.com>; akshay kulkarni <akshay_e4 using hotmail.com>
Cc: R help Mailing list <r-help using r-project.org>
Subject: Re: [R] is.na with lists....

People often use sum() to count how many boolean values are true, not length).

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On Sat, Jul 2, 2022 at 2:14 PM, Andrew Simmons
<akwsimmo using gmail.com> wrote:
It's supposed to match the length. Perhaps you meant to use which(is.na())?

On Sat, Jul 2, 2022, 14:04 akshay kulkarni <akshay_e4 using hotmail.com<mailto:akshay_e4 using hotmail.com>> wrote:

> Dear memebers,
>                            I have list of stock data OHLCData for 500
> stocks, 15 of whom are NA's. The following is the code:
>
> require(quantmod)
> getOHLCData <- function(NSESym) {
>  OHLCData1 <- list()
>  for(i in 1:500){
>    OHLCData1[[i]] <- tryCatch(getSymbols(NSESym[i], auto.assign=FALSE),
>                          error = function (e) {print(i); return(NA)})
>
>  }
>  return(OHLCData1)
> }
>
>  OHLCData <- getOHLCData(NSESym)
>
> however, when I check for is.na, I get the following:
>
> length(OHLCData)
> [1] 500
> > length(is.na(OHLCData))
> [1] 500
>
> length(is.na(OHLCData)) should return 15. Whats going wrong? I assume
> is.na returns TRUE if there is an NA.
>
> Yours sincerely,
> AKSHAY M KULKARNI
>
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>
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______________________________________________
R-help using r-project.org<mailto:R-help using r-project.org> mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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