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add chapter 11

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Bogumił Kamiński 2022-02-14 16:37:49 +01:00
parent 3d33b999c9
commit a7f0c90b46
2 changed files with 78 additions and 3 deletions
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6
appB.jl
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@ -165,6 +165,12 @@ proptable([walk_unique_2ahead() for _ in 1:10^5])
@time wide = DataFrame(ones(1, 10_000), :auto);
@time Tables.columntable(wide);
# Code for exercise 11.2
using Statistics
Dict(key.city => mean(df.rainfall) for (key, df) in pairs(gdf_city))
combine(gdf_city, :rainfall => mean)
# Code for exercise 12.1
cg = complete_graph(37700)

75
ch11.jl
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@ -4,6 +4,12 @@
# Code for section 11.1
# deserialization of source data frame
using DataFrames
using Serialization
walk = deserialize("walk.bin")
# Code for a note on conversion
x = [1.5]
@ -12,9 +18,6 @@ x
# Code from section 11.1.1
using Serialization
walk = deserialize("walk.bin")
Matrix(walk)
Matrix{Any}(walk)
Matrix{String}(walk)
@ -83,3 +86,69 @@ identity.(eachcol(walk))
df = DataFrame(x=1:2, b=["a", "b"])
identity.(eachcol(df))
# Code from section 11.2
using CSV
raw_data = """
city,date,rainfall
Olecko,2020-11-16,2.9
Olecko,2020-11-17,4.1
Olecko,2020-11-19,4.3
Olecko,2020-11-20,2.0
Olecko,2020-11-21,0.6
Olecko,2020-11-22,1.0
Ełk,2020-11-16,3.9
Ełk,2020-11-19,1.2
Ełk,2020-11-20,2.0
Ełk,2020-11-22,2.0
""";
rainfall_df = CSV.read(IOBuffer(raw_data), DataFrame)
gdf_city = groupby(rainfall_df, "city")
gdf_city_date = groupby(rainfall_df, Not("rainfall"))
keys(gdf_city_date)
gk1 = keys(gdf_city_date)[1]
g1_t = Tuple(gk1)
g1_nt = NamedTuple(gk1)
g1_dict = Dict(gk1)
gdf_city_date[1]
gdf_city_date[gk1]
gdf_city_date[g1_t]
gdf_city_date[g1_nt]
gdf_city_date[g1_dict]
gdf_city[("Olecko",)]
gdf_city[(city="Olecko",)]
using BenchmarkTools
bench_df = DataFrame(id=1:10^8);
bench_gdf = groupby(bench_df, :id);
@btime groupby($bench_df, :id);
bench_i = 1_000_000;
bench_gk = keys(bench_gdf)[bench_i];
bench_t = Tuple(bench_gk);
bench_nt = NamedTuple(bench_gk);
bench_dict = Dict(bench_gk);
@btime $bench_gdf[$bench_i];
@btime $bench_gdf[$bench_gk];
@btime $bench_gdf[$bench_t];
@btime $bench_gdf[$bench_nt];
@btime $bench_gdf[$bench_dict];
gdf_city[[2, 1]]
gdf_city[[1]]
[nrow(df) for df in gdf_city]
for p in pairs(gdf_city)
println(p)
end
Dict(key.city => nrow(df) for (key, df) in pairs(gdf_city))
combine(gdf_city, nrow)