[英]How to melt R data.frame and plot group by bar plot
我有以下R data.frame:
group match unmatch unmatch_active match_active
1 A 10 4 0 0
2 B 116 20 0 3
3 c 160 27 1 4
4 D 79 17 0 3
5 E 309 84 4 14
6 F 643 244 10 23
...
我的目標是通過條形圖繪制一組( http://www.cookbook-r.com/Graphs/Bar_and_line_graphs_(ggplot2)/section-Graphs with more variables),如鏈接所示。
我意識到在開始之前我需要將數據轉換為以下格式
group variable value
1 A match 10
2 B match 116
3 C match 160
4 D match 79
5 E match 309
6 F match 643
7 A unmatch 4
8 B unmatch 20
...
我使用了熔化功能:
groups.df.melt <- melt(groups.df[,c('group','match','unmatch', 'unmatch_active', 'match_active')],id.vars = 1)
我不認為我正在融化正確,因為在我執行上面的groups.df.melt有1000多行對我沒有意義。
我看了如何在R中的多列上繪制每行的直方圖,並嘗試遵循相同但我沒有得到我想要的圖形。
另外我得到以下錯誤:當我嘗試進行繪圖時:
ggplot(groups.df.melt, aes(x='group', y=value)) + geom_bar(aes(fill = variable), position="dodge") + scale_y_log10()
Mapping a variable to y and also using stat="bin".
With stat="bin", it will attempt to set the y value to the count of cases in each group.
This can result in unexpected behavior and will not be allowed in a future version of ggplot2.
If you want y to represent counts of cases, use stat="bin" and don't map a variable to y.
If you want y to represent values in the data, use stat="identity".
See ?geom_bar for examples. (Deprecated; last used in version 0.9.2)
Error in pmin(y, 0) : object 'y' not found
嘗試:
mm <- melt(ddf, id='group')
ggplot(data = mm, aes(x = group, y = value, fill = variable)) +
geom_bar(stat = 'identity', position = 'dodge')
要么
ggplot(data = mm, aes(x = group, y = value, fill = variable)) +
# `geom_col()` uses `stat_identity()`: it leaves the data as is.
geom_col(position = 'dodge')
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