R使用spread()从长格式更改为宽格式
示例
library(tidyr)
## example data
set.seed(123)
df <- data.frame(
name = rep(c("firstName", "secondName"), each=4),
numbers = rep(1:4, 2),
value = rnorm(8)
)
df
# name numbers value
# 1 firstName 1 -0.56047565
# 2 firstName 2 -0.23017749
# 3 firstName 3 1.55870831
# 4 firstName 4 0.07050839
# 5 secondName 1 0.12928774
# 6 secondName 2 1.71506499
# 7 secondName 3 0.46091621
# 8 secondName 4 -1.26506123我们可以将“数字”列“扩展”为单独的列：
spread(data = df,
key = numbers,
value = value)
# name 1 2 3 4
# 1 firstName -0.5604756 -0.2301775 1.5587083 0.07050839
# 2 secondName 0.1292877 1.7150650 0.4609162 -1.26506123或将“名称”列分散到单独的列中：
spread(data = df,
key = name,
value = value)
# numbers firstName secondName
# 1 1 -0.56047565 0.1292877
# 2 2 -0.23017749 1.7150650
# 3 3 1.55870831 0.4609162
# 4 4 0.07050839 -1.2650612