[Julia]未処理

• count(x->x<0, weogn.b)

• x[x % 2 .== 0] と sum(weogn.b[weogn.b .> 0]) データフレームでもarrayでも

• df[(df.A .!= "Y") .& (df.B .!= "D"), :]

• https://discourse.julialang.org/t/finding-the-set-of-keys-with-the-same-value-in-a-dictionnary/10578

• https://discourse.julialang.org/t/how-to-get-values-of-dictionary-by-using-array-of-keys/73650