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@hadley hadley released this 08 Nov 13:19
v2.2.0
c002072

Partial reading

Thanks to the hard work of @mikmart, all read_*() functions gain three new arguments that allow you to read in only part of a large file:

  • col_select: selects columns to read with a tidyselect interface (#248).
  • skip: skips rows before reading data (#370).
  • n_max: limits the number of rows to read.

This also brings with it a deprecation: cols_only in read_sas() has been deprecated in favour of the new col_select argument.

Minor improvements and bug fixes

  • as_factor() allows non-unique labels when levels = "label". This fixes
    a particularly annoying printing bug (#424, @gergness)

  • read_sas() now supports (IS|E|B)8601(DT|DA|TM) date/time formats (@mikmart).

  • All write_ functions gain a .name_repair argument that controls
    what happens when the input dataset has repeated column names (#436).

  • All write_ functions can now write labelled vectors with NULL labels
    (#442).

  • write_dta() can now write dataset labels with the label argument,
    which defaults to the label attribute of the input data frame, if present
    (@gorcha, #449).

  • write_dta() works better with Stata 15, thanks to updated ReadStat (#461)

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