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melt fails when pattern not found #3106

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MichaelChirico opened this issue Oct 12, 2018 · 0 comments
Closed

melt fails when pattern not found #3106

MichaelChirico opened this issue Oct 12, 2018 · 0 comments
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bug
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1.12.0

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@MichaelChirico
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DT = data.table(id = 1:3, a1 = rnorm(10), a2 = rnorm(10))
melt(DT, id.vars = 'id', measure.vars = patterns(a = 'a', b = 'b'))

Error in melt.data.table(DT, id.vars = "id", measure.vars = patterns(a = "a", :
Unsupported type 'NULL'

Quite a confusing error
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@mattdowle @st-pasha @MichaelChirico