Comments (9)
To clarify - the "wish" is for when there is an explicit i
. I know there are alternatives but I'd still like the default behaviour to be consistent and always return an object of the same type (data frame) irrespective of the length of j. Not, for example
rows <- 1:3
class(mtcars[rows, 1L])
#> [1] "numeric"
class(mtcars[rows, 1:2])
#> [1] "data.frame"
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@chainsawriot Then people's packages start behaving differently for each user and/or script. The option already didn't work for stringsAsFactors
, it is not going to work for this, either.
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I noticed you only mentioned [.data.frame
. Since data.frames are a hybrid between lists and matrices we can just use the list substitution [i]
, instead of the matrix way [,i]
. So:
iris[1]
iris["Species"]
iris[c(1,2,3)]
All preserve data.frame without the need for drop=FALSE
.
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As a package developer, I often have dynamic input in the j
-slot that is user controlled. Forgetting the drop=FALSE
can lead to nasty bugs as often the code afterward assumes the resulting object is still a data.frame.
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@ltuijnder as mentioned above: using df[j]
instead of df[,j]
should solve this problem for you.
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This recently confused me as I was writing code iterating over the rows of data frames and sometimes the data frame only had one column.
Here's an example of what went wrong:
> data.frame(x = 42)[1,]
[1] 42
I didn't want it to lose its data.frame-ness. tibbles have sensible defaults:
> tibble(x = 42)[1,]
# A tibble: 1 × 1
x
<dbl>
1 42
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This became a fairly divisive topic on Mastodon. This behavior is not intuitive or user friendly. https://fosstodon.org/@josi/111096750116664099
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This issue should be about matrices and arrays preserving dimensionality (and hence matrix/array objects) after [
selection. As it affects these objects first. And data.frame
matrix-based selection would then follow too. Changing the behaviour only for data.frames
would introduce an inconsistency between data.frame
and matrix
objects.
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As a possible interim solution is to make drop
of current x[i, j, ... , drop = TRUE]
to getOption("default.drop", TRUE)
, i.e. x[i, j, ... , drop = getOption("default.drop", TRUE)]
.
It can then be set per session (or per user, if one puts that in the initialization script): options(default.drop = FALSE)
.
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Related Issues (20)
- Fast check for discreteness
- Make UTF-8 the default encoding for package metadata HOT 2
- WISH/ROBUSTNESS: Mechanism to prevent var <<- value from assigning non-existing 'var' HOT 1
- Consistency: fix matrix subsetting behaviour to be consistent with vectors and data.frames.
- Base R function for length(unique(x))
- WISH: Standardized SystemRequirements HOT 1
- `grDevices::dev.capabilities()` enhancements
- Permit larger seed argument values in set.seed() HOT 1
- Wish: base version of glue::glue() HOT 3
- Add predict method for `stats::kmeans()`
- R CMD check: Option for reporting on writes/updates to tools::R_user_dir() during checks HOT 1
- R CMD check: Option for testing with empty tools::R_user_dir() folders
- Control over `NA` equality in `base::rle()`
- WISH: Make serverSocket(0) useful (+ find a random TCP port that can be listened to) HOT 1
- Task & browser hooks to support implementation of a debug adapter protocol client
- parallel: A sequential cluster
- parallel: Two types of 'cluster':s - one a subclass of the other HOT 1
- WISH: `load()` to have an option to bust saved unevaluated promise objects (`PROMSXP`) HOT 2
- WISH: Customizable print method for character vector with long text
- WISH: Control over rownames creation in data.frame subsetting (massive speed-up)
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