移除長條

Julia 資料視覺化入門

Gustavo Vieira Suñe

Data Analyst

長條圖

顯示印度不同產品平均價格的長條圖。

長條圖 vs 直方圖

數值資料的分佈

顯示洋蔥與小麥價格分佈的直方圖。

類別之間的比較

顯示印度不同產品平均價格的長條圖。

我們的資料集

Date	State	Centre	Product	Price
APR-2001	Andhra Pradesh	Chittoor	Bathing Soap	10.0
APR-2001	Andhra Pradesh	Chittoor	Ink	10.0
...	...	...	...	...
SEP-2016	Bihar	Patna	Paper	38.0
SEP-2016	Bihar	Patna	Toothpaste	50.0

平均價格（using Statistics）

# Group by each product
grouped = groupby(product, :Product)

# Calculate average prices
mean_prices = combine(
    grouped,
    :Price => mean
)

# Sort from higest to lowest
sorted_mean_prices = sort(
    mean_prices,
    :Price_mean,
    rev=true
)

建立長條圖

# Create bar chart
bar(
    # Categories in x-axis
    sorted_mean_prices.Product,
    # Values in y-axis
    sorted_mean_prices.Price_mean,

    # Set bar width
    bar_width=0.5

    label=false,
    color=:royalblue1,
 )
title!("Product Prices in India")
ylabel!("Average Price (Rupees)")

顯示印度不同產品平均價格的長條圖。

水平長條圖

# Create bar chart
bar(
    # Values in the y-axis
    sorted_mean_prices.Product,
    # Values in x-axis
    sorted_mean_prices.Price_mean,

    # Set orientation to horizontal
    permute=(:x, :y),

    label=false,
    color=:royalblue1,
)
title!("Product Prices in India")
xlabel!("Average Price (Rupees)")

顯示印度不同產品平均價格的水平長條圖。

按州別的產品

篩選指定州別

filtered_product = filter(
    row -> row.State in ["Maharashtra", "Goa", "Gujarat"],
    product)

依州別計算各產品平均價

# Group by state and product
filtered_grouped = groupby(filtered_product, [:State, :Product])

# Calculate average prices
filtered_mean_prices = combine(
    filtered_grouped, :Price => mean
)

群組長條圖

# Create grouped bar chart
groupedbar(
    # Categories in x-axis
    filtered_mean_prices.Commodity,
    # Values in y-axis
    filtered_mean_prices.Price_mean,

    # Define groups
    group=filtered_mean_prices.State,

    color=[:teal :yellow2 :tomato3]
)
title!("Prices in India by State")
ylabel!("Average Price (Rupees)")

顯示印度部分產品依州別分組、並列顯示的群組長條圖。

堆疊長條

# Create grouped bar chart
groupedbar(
    # Categories in x-axis
    filtered_mean_prices.Commodity,
    # Values in y-axis
    filtered_mean_prices.Price_mean, 
    # Define groups
    group=filtered_mean_prices.State,
    color=[:teal :snow2 :tomato3],

    # Stack the bars
    bar_position=:stack

)
title!("Product Prices in India by State")
ylabel!("Average Price (Rupees)")

顯示印度部分產品依州別分組、以堆疊方式呈現的群組長條圖。

一起來練習吧！

Julia 資料視覺化入門