julia - 无法将 DataFrame 转换为系列数据以在 julia 中绘图

Question

我正在从 https://docs.juliaplots.org/latest/basics/ 学习 julia
这是 Julia 代码

using Plots,UnicodePlots,RDatasets
unicodeplots()
v=dataset("Ecdat","Airline")
typeof(v)
plot(v, :Cost) # this line will produce the error
plot(v) # this line will produce the error, too

我有

ERROR: Cannot convert DataFrame to series data for plotting
Stacktrace:
 [1] prepareSeriesData(::DataFrame) at /home/dlin/.julia/packages/Plots/qZHsp/src/series.jl:14
 [2] convertToAnyVector(::DataFrame, ::Dict{Symbol,Any}) at /home/dlin/.julia/packages/Plots/qZHsp/src/series.jl:26
 [3] macro expansion at /home/dlin/.julia/packages/Plots/qZHsp/src/series.jl:130 [inlined]
 [4] apply_recipe(::Dict{Symbol,Any}, ::Type{Plots.SliceIt}, ::Nothing, ::DataFrame, ::Nothing) at /home/dlin/.julia/packages/RecipesBase/zBoFG/src/RecipesBase.jl:275
 [5] _process_userrecipes(::Plots.Plot{Plots.GRBackend}, ::Dict{Symbol,Any}, ::Tuple{DataFrame}) at /home/dlin/.julia/packages/Plots/qZHsp/src/pipeline.jl:83
 [6] _plot!(::Plots.Plot{Plots.GRBackend}, ::Dict{Symbol,Any}, ::Tuple{DataFrame}) at /home/dlin/.julia/packages/Plots/qZHsp/src/plot.jl:178
 [7] #plot#138(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::typeof(plot), ::DataFrame) at /home/dlin/.julia/packages/Plots/qZHsp/src/plot.jl:57
 [8] plot(::DataFrame) at /home/dlin/.julia/packages/Plots/qZHsp/src/plot.jl:51
 [9] top-level scope at REPL[4]:1

在series.jl的代码中，是

prepareSeriesData(x) = error("Cannot convert $(typeof(x)) to series data for plotting")

如何纠正这个？

Answer 1

文档的那部分可能已经过时了。您必须使用 StatsPlots 和 @df 宏来获得所需的行为。

julia> using StatsPlots

julia> @df v plot(:Cost)
                      ┌────────────────────────────────────────────────────────────┐   
         4.88870026e6 │⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⣠⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│ y1
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⢰⢹⠀⠀⠀⠀⠀⠀⠀⠀⢀⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⡎⢸⠀⠀⠀⠀⠀⠀⠀⠀⡸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⢀⠎⠀⢸⠀⠀⠀⠀⠀⠀⠀⢠⠃⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⢸⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⡇⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⡎⠀⠀⢸⠀⠀⠀⠀⠀⠀⢸⠀⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⡇⠀⠀⢸⠀⠀⠀⠀⠀⠀⡎⠀⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⢰⠁⠀⠀⢸⠀⠀⠀⠀⠀⠀⡇⠀⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⡸⠀⠀⠀⢸⠀⠀⠀⠀⠀⢰⠁⠀⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⢀⠇⠀⠀⠀⢸⠀⠀⠀⠀⠀⢸⠀⠀⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⠀⡼⠀⠀⠀⠀⠈⡆⠀⠀⠀⠀⡇⠀⠀⠀⢣⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⠀⡰⠁⠀⠀⠀⠀⠀⡇⠀⠀⠀⢰⠁⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⠀⡰⠁⠀⠀⠀⠀⠀⠀⡇⠀⠀⢠⠇⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡇⡰⠁⠀⠀⠀⠀⠀⠀⠀⡇⠀⢀⠇⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⣀⠀⠀⠀⠀⠀⠀⠀⢀⠜⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀│   
                      │⠀⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⠀⡎⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⢀⠜⠊⢸⠀⠀⠀⠀⠀⠀⢀⠎⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡄⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇⡼⠀⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⢠⠋⠀⠀⢸⠀⠀⠀⠀⠀⠀⡎⠀⠀⢱⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡜⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠋⠀⠀⠀⠀⠀⠀⠀⠀⢸⠀⠀⡠⠒⠁⠀⠀⠀⠀⡇⠀⠀⠀⢀⠜⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⡠⠔⢲⠀⠀⠀⠀⠀⠀⠀⡔⠁⠀⠀│   
                      │⠀⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⠒⠊⠀⠀⠀⠀⠀⠀⠀⡇⡠⠖⠉⠁⠀⠀⠀⠀⢸⠀⠀⠀⢀⡠⠒⠁⠀⠈⡆⠀⠀⠀⠀⡠⠎⠀⠀⠀⠀│   
   -71402.26000000001 │⠤⡧⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠤⠭⠤⠤⠤⠤⠤⠤⠤⠤⠼⠶⠾⠭⠥⠤⠤⠤⠤⠤⠷⠶⠾⠭⠭⠤⠤⠤⠤⠤⠤│   
                      └────────────────────────────────────────────────────────────┘   
                      -1.67                                                    92.67

这在手册的后面部分进行了解释: https://docs.juliaplots.org/latest/input_data/#dataframes-support