[R] confusion about write.csv

[Bert Gunter]

... :

"arguments to write.table: append, col.names, sep, dec and qmethod cannot
be altered."

The default is FALSE, so cannot be altered.


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Thu, Jun 4, 2020 at 6:34 PM Erin Hodgess <erinm.hodgess using gmail.com> wrote:

>  Hello!
>
> Hope everyone is doing as well as possible.
>
> I have a question about write.csv.  I thought that the append argument
> would permit adding another data frame with the same column names.
>
> Here is my example:
>
>  date1 <- as.Date("2020-03-09")
>  wday <- weekdays(date1)
>  x1 <- data.frame(date=date1,day=wday,lev=1:5,y=rnorm(5))
>  x1
>         date    day lev           y
> 1 2020-03-09 Monday   1 -0.09543049
> 2 2020-03-09 Monday   2  0.53943428
> 3 2020-03-09 Monday   3 -0.79224851
> 4 2020-03-09 Monday   4  0.68168147
> 5 2020-03-09 Monday   5 -1.02902897
>  write.csv(file="test1.csv",x1,row.names=FALSE)
>  date1 <- date1 + 1
>  wday <- weekdays(date1)
>  x2 <- data.frame(date=date1,day=wday,lev=1:5,y=rnorm(5))
>  x2
>         date     day lev          y
> 1 2020-03-10 Tuesday   1 -0.6648301
> 2 2020-03-10 Tuesday   2 -0.1137580
> 3 2020-03-10 Tuesday   3  1.6532675
> 4 2020-03-10 Tuesday   4 -0.5845293
> 5 2020-03-10 Tuesday   5  0.2849392
>  write.csv(file="test1.csv",x2,row.names=FALSE,append=TRUE)
> Warning message:
> In write.csv(file = "test1.csv", x2, row.names = FALSE, append = TRUE) :
>   attempt to set 'append' ignored
>
> The values from x2 appear in the test1.csv file.
>
> What am I missing, please?
>
> Thanks,
> Erin
>
>
> Erin Hodgess, PhD
> mailto: erinm.hodgess using gmail.com
>
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>
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