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

[Avi Gross]

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> 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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