Hello Ivan, thanks for this.
> Part of the problem is that it's not obvious what should be a
> zero-column but non-zero-row data.frame mean.
>
> On the one hand, your database relation use case is entirely valid. On
> the other hand, if data.frames are considered to be tables of data with
>
Hello Mark,
В Fri, 5 Apr 2024 03:58:36 + (UTC)
Mark Webster via R-help пишет:
> I found what looks to me like an odd edge case for duplicated(),
> unique() etc. on data frames with zero columns, due to duplicated()
> returning a zero-length vector for them, regardless of the number of
>
Hello,
I found what looks to me like an odd edge case for duplicated(), unique() etc.
on data frames with zero columns, due to duplicated() returning a zero-length
vector for them, regardless of the number of rows:
df <- data.frame(a = 1:5)df$a <- NULLnrow(df) # 5 (row count preserved by
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