[Rd] write.csv problems

Rui Barradas
Sat, 29 Jun 2024 19:24:52 -0000

?s 17:02 de 28/06/2024, Spencer Graves escreveu:
> Hello, All:
>
>
>  ????? I'm getting strange errors with write.csv with some objects of
> class c('findFn', 'data.frame'). Consider the following:
>
>
> df1 <- data.frame(x=1)
> class(df1) <- c('findFn', 'data.frame')
> write.csv(df1, 'df1.csv')
> # Error in x$Package : $ operator is invalid for atomic vectors
>
> df2 <- data.frame(a=letters[1:2],
>  ????? b=as.POSIXct('2024-06-28'))
> class(df2) <- c('findFn', 'data.frame')
> write.csv(df2, 'df1.csv')
> # Error in tapply(rep(1, nrow(x)), xP, length) :
> #? arguments must have same length
>
>
>  ????? "write.csv" works with some objects of class
c('findFn',
> 'data.frame') but not others. I have 'findFn' object with
5264 rows that
> fails with the following error:
>
>
> Error in `[<-.data.frame`(`*tmp*`, needconv, value = list(Count =
> c("83",? :
>  ? replacement element 1 has 526 rows, need 5264
>
>
>  ????? I have NOT yet been able to reproduce this error with a smaller
> example. However, starting 'write.csv' with something like the
following
> should fix all these problems:
>
>
> if(is.data.frame(x)) class(x) <- 'data.frame'
>
>
>  ????? Comments?
>  ????? Thanks for all your work to help improve the quality of
> statistical software available to the world.
>
>
>  ????? Spencer Graves
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
Hello,

I don't know if this answers to question.
I wasn't able to reproduce errors but warnings, yes I was.

A way of not giving errors or warnings is to call write.csv at the end
of a pipe such as the following.


df1 <- findFn("mean")
df1 |> as.data.frame() |> write.csv("df1.csv")


This solution is equivalent to the code proposed in the OP without the
need for a change in base R.

Hope this helps,

Rui Barradas


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