Filter a number when missing values are in column

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21

Another solution that hasn’t been mentioned yet is to use === instead of == for comparisons.

julia> 5 == missing
missing

julia> 5 === missing
false
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22

There are a lot of answers in this thread already that tell you how to do it, e.g.:

julia> df[coalesce.(df.a .!= 5, true), :]
4×2 DataFrame
 Row │ a        b     
     │ Int64?   Int64 
─────┼────────────────
   1 │       3      1
   2 │       6      3
   3 │       0      4
   4 │ missing      5

or

julia> df[.!isequal.(df.a, 5), :]
4×2 DataFrame
 Row │ a        b     
     │ Int64?   Int64 
─────┼────────────────
   1 │       3      1
   2 │       6      3
   3 │       0      4
   4 │ missing      5
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23

OP, there is also the macro flag @passmissing in DataFramesMeta.jl which will help you work with missings, but it will not solve your exact problem in this thread.

24

FWIW, using findall() seems to be more performant here:

df[findall(!isequal(5), df.a), :]
1 Like