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Negative select in fread #2423

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Negative select in fread#2423
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fread
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v1.11.0

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@MichaelChirico
MichaelChirico
opened on Oct 17, 2017
fread('v1,v2,v3,v4,v5\n1,2,3,4,5', select = -1L)

Error in fread("v1,v2,v3,v4,v5\n1,2,3,4,5", select = -1L) :
Column number -1 (select[1]) is out of range [1,ncol=5]

Seems natural enough to allow negative selection as elsewhere in R & [.data.table

Expected output

data.table(V2 = 2, V3 = 3, V4 = 4, V5 = 5)
#    V2 V3 V4 V5
# 1:  2  3  4  5

Activity

  1. MichaelChirico
    added
    fread
    on Oct 17, 2017

  2. MichaelChirico commented on Oct 17, 2017

    @MichaelChirico
    MichaelChirico
    on Oct 17, 2017
    MemberAuthor

    Hmm, of course there's drop. Perhaps a nudge message ("Are you sure you didn't mean drop = ..." when select is all negative), or automatically flipping select to drop (and vice versa) when all indices are negative...

  3. mattdowle
    added this to the milestone on Oct 24, 2017
  4. mattdowle
    closed this as completedin 5f15813on Oct 25, 2017
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