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Questions - dataframesmeta.jl

Sort Julia DataFrame in descending Order

I have a DataFrame using DataFrames using DataFramesMeta using Chain df = DataFrame(a=1:3,b=4:6) that I want to sort descending by column :a. Doing it ascending is intuitive... @chain df begin @...
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Georgery

dataframe

julia

dataframes.jl

dataframesmeta.jl

Votes: 0

Answers: 2

Latest Answer

So, if you have a numeric column, you can simply negate it... using DataFrames using DataFramesMeta using Chain df = DataFrame(a=1:3,b=4:6) @chain df begin @orderby(-:a) end But this logic does...
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Georgery

Julia subsetting dataframe with multiple conditions

In DataFramesMeta, why should I wrap every condition within a pair of parentheses? Below is an example dataframe where I want a subset that contains values greater than 1 or is missing. d = DataFrame(...
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Lobshi

julia

dataframesmeta.jl

Votes: 0

Answers: 1

Latest Answer

The reason is operator precedence (and is unrelated to DataFramesMeta.jl). See: julia> dump(:(2 > 1 | 3 > 4)) Expr head: Symbol comparison args: Array{Any}((5,)) 1: Int64 2 2: Sym...
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Bogumił Kamiński

Malformed expression in DataFramesMeta.js when @selecting from DataFrame using a Symbol("x") expression

I have a Julia DataFrame which I can work with fine in any normal way. For example, let's say the df is df = DataFrame(:x => [1,2,3], :y => [4,5,6], :z => [7,8,9]); I can easily do julia>...
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Morpheu5

julia

symbols

dataframes.jl

dataframesmeta.jl

Votes: 0

Answers: 1

Latest Answer

If you want the call to Symbol constructor be parsed verbatim you need to escape it with $: julia> @select(df, $(Symbol("y"))) 3×1 DataFrame Row │ y │ Int64 ─────┼─────── 1 │ ...
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Bogumił Kamiński

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