[Rd] write.csv problems

[Rui Barradas]

Às 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 using 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


-- 
Este e-mail foi analisado pelo software antivírus AVG para verificar a presença de vírus.
www.avg.com