[R] coursera course - assgnment - error : Error in which(!is.Na(content[["sulfate"]])) : , could not find function "is.Na"

[Rui Barradas]

Hello again,

I've just read your code more carefully and I believe you should read 
the help page ?complete.cases and run the examples therein.
Tip: don't compare the return value with 0, it's nonsense.

Rui Barradas

Em 03-11-2016 16:40, Roelof Wobben escreveu:
> Hello,
>
> I want to try to get all the data of a cloumn namend "sulfate" which is
> not Na.
>
> So I did :
>
> corr <- function(directory, threshold = 0) {
>
>    # lezen van alle bestanden in  de directory
>
>    file_list <-  list.files( directory, pattern = "*.csv", full.names =
> TRUE)
>
>     # lezen van alle bestanden in a loop
>    #  1) bepalen van de complete_cases
>    #  2) controleren of het hoger/lager is dan de treshold.
>    #  3) als het hoger is.
>    #     a) lezen van de nitraat en controleren of het geen Na is
>    #     b) lezen van de sulfaat en controleren of het geen Na is.
>    #     c) als beide geen Na zijn, dan de correlatie bepalen
>
>    for(file in file_list) {
>      content <- read.csv(file)
>      if (complete.cases(content) > 0) {
>        sulfate <- which (!is.Na(content[["sulfate"]]))
>        print(sulfate)
>
>      }
>
>      }
>
>    }
>
> but now I see the above error.
>
> What did I do wrong ?
>
> Regards,
>
> Roelof
>
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