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print.tbl_df should display columns for zero-row output #652

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wch opened this issue Oct 2, 2014 · 2 comments
Closed

print.tbl_df should display columns for zero-row output #652

wch opened this issue Oct 2, 2014 · 2 comments
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@wch
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@wch wch commented Oct 2, 2014

As things work now, no columns names are printed for zero-row output, and this can be confusing for users. It requires using str() just to find out what the columns are. See rstudio/ggvis#293 for an example of this confusion.

as.tbl(mtcars[0, ])
# Source: local data frame [0 x 11]
@hadley hadley added the feature label Oct 30, 2014
@hadley hadley added this to the 0.3.1 milestone Oct 30, 2014
@hadley hadley self-assigned this Oct 30, 2014
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@hadley hadley commented Nov 18, 2014

What do you want it to print?

Source: local data frame [0 x 11]
  mpg cyl disp  hp drat   wt  qsec vs am gear carb

?

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@wch wch commented Nov 18, 2014

That output looks reasonable.

@hadley hadley closed this in 7409ccc Nov 20, 2014
krlmlr pushed a commit to krlmlr/dplyr that referenced this issue Mar 2, 2016
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