我有以下虚拟数据:
library(dplyr)
library(tidyr)
library(reshape2)
dt <- expand.grid(Year = 1990:2014, Product=LETTERS[1:8], Country = paste0(LETTERS, "I")) %>% select(Product, Country, Year)
dt$value <- rnorm(nrow(dt))
我 Select 了两种产品组合
sdt <- dt %>% filter((Product == "A" & Country == "AI") | (Product == "B" & Country =="EI"))
我想看到每种组合的并排值.我可以用dcast
:
sdt %>% dcast(Year ~ Product + Country)
用tidyr号包装中的spread
个可以这样做吗?