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.SDcols=function shorthand #3950

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MichaelChirico opened this issue Oct 8, 2019 · 0 comments · Fixed by #3991
Closed

.SDcols=function shorthand #3950

MichaelChirico opened this issue Oct 8, 2019 · 0 comments · Fixed by #3991
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@MichaelChirico
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@MichaelChirico MichaelChirico commented Oct 8, 2019

Much like .SDcols = patterns is useful as a shorthand for filtering columns and much like setnames now accepts functions, .SDcols=function is (1) currently an error and (2) should translate pretty naturally as a shorthand for filtering in .SDcols.

e.g.

DT[ , lapply(.SD, sum), .SDcols = is.numeric]

Should be easy to apply ! as well.

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