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Print zero-column data.frame properly #3363

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merged 3 commits into from Feb 8, 2019
Merged

Print zero-column data.frame properly #3363

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2dc6795
Print zero-column data.frame properly
heavywatal Feb 6, 2019
8c36116
Tidied output; e.g. Null is specially for 0 row 0 col
mattdowle Feb 7, 2019
798e042
Fixed tests and added a new one to cover the fixed error
mattdowle Feb 8, 2019
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2 changes: 2 additions & 0 deletions NEWS.md
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Expand Up @@ -20,6 +20,8 @@

4. The Travis build matrix is expanded to OSX and to the R previous major and R-devel releases [#3326](https://github.com/Rdatatable/data.table/issues/3326). An OpenMP enabled compiler is required to correctly build on OSX, therefore the homebrew llvm package is installed on the Travis (OSX) machine before R CMD build is run. The OSX build on R-devel was explicitly excluded because it's currently unstable. Thanks @marcusklik for the PR.

5. Improve `print.data.table()` to handle `data.frame` with 0 column properly.
Thanks @heavywatal for the PR.

### Changes in v1.12.0 (13 Jan 2019)

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4 changes: 2 additions & 2 deletions R/print.data.table.R
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Expand Up @@ -42,9 +42,9 @@ print.data.table <- function(x, topn=getOption("datatable.print.topn"),
cat("Ind", if (length(ixs) > 1L) "ices" else "ex", ": <",
paste(ixs, collapse=">, <"), ">\n", sep="")
}
if (nrow(x) == 0L) {
if (any(dim(x) == 0L)) {
if (length(x)==0L)
cat("Null data.table (0 rows and 0 cols)\n") # See FAQ 2.5 and NEWS item in v1.8.9
cat("Null data.table (", dim(x)[1L], " rows and 0 cols)\n", sep = "") # See FAQ 2.5 and NEWS item in v1.8.9
else
cat("Empty data.table (0 rows) of ",length(x)," col",if(length(x)>1L)"s",": ",paste(head(names(x),6L),collapse=","),if(ncol(x)>6L)"...","\n",sep="")
return(invisible(x))
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