dplyr:根据两列删除值

Question

运用 df

date <- c(rep(as.Date("2003-01-05"), 5), rep(as.Date("2004-01-05"), 5), rep(as.Date("2005-01-05"), 5), rep(as.Date("2006-01-05"), 5))
parameter <- rep(c("param_A", "param_B", "param_C", "param_D", "param_E"), 4)

df <- data.frame(date, parameter)
df$year <- year(df$date)

我怎样才能删除param_A,2003但保留所有其他年份？

Answer 1

我们可以试试 filter

df %>% 
    filter(!(parameter=="param_A" & year == 2003))