is.na with lists.... - R-help

Sat, Jul 2, 2022 11:03 AM #

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

[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

Andrew Simmons

Sat, Jul 2, 2022 11:06 AM #

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 at hotmail.com> wrote:

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Avi Gross

Sat, Jul 2, 2022 11:17 AM #

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 at 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 at hotmail.com> wrote:

______________________________________________
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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.

??? [[alternative HTML version deleted]]

______________________________________________
R-help at 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
and provide commented, minimal, self-contained, reproducible code.

akshay kulkarni

Sat, Jul 2, 2022 11:18 AM #

Dear Andrew,
                      It's working! Thanks... I thought the following

would return

[1] 1

But got to know the difference ... thanks.

Yours sincerely,
AKSHAY M KULKARNI

akshay kulkarni

Sat, Jul 2, 2022 11:19 AM #

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

Yours sincerely,
AKSHAY M KULKARNI

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

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

Sent from the all new AOL app for Android<https://play.google.com/store/apps/details?id=com.aol.mobile.aolapp>

On Sat, Jul 2, 2022 at 2:14 PM, Andrew Simmons
<akwsimmo at 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 at hotmail.com<mailto:akshay_e4 at 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
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To UNSUBSCRIBE and more, see
> 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.

>

    [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To UNSUBSCRIBE and more, see
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.