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DimensionMismatch when checking if the cell value (not) belong to a collection #3316

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mzy2240 opened this issue Apr 18, 2023 · 1 comment

mzy2240 commented Apr 18, 2023

using DataFrames

ids = [1,5,7,8,9]
a = DataFrame(A=1:3, B=4:6)
@. a.B = ifelse(a.A ∉ ids, 0, a.B)

using DataFrames

ids = [1,5,7,8,9]
a = DataFrame(A=1:3, B=4:6)
@. a.B = ifelse(a.A ∉ Ref(ids), 0, a.B)

Both will raise DimensionMismatch issue.

Member

bkamins commented Apr 18, 2023 •

edited

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This is unrelated with DataFrames.jl. Use this instead:

julia> a.B .= ifelse.(a.A .∉ Ref(ids), 0, a.B)
3-element Vector{Int64}:
 4
 0
 0

see https://bkamins.github.io/julialang/2023/02/10/in.html for a detailed explanation.

bkamins closed this as completed

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