我只需要保留该图列中的31B行。结构是这样的:
CO2S H2OS PLOT
412 102 31
413 102 31
414 102 31B
415 102 31B
谢谢!
df_1 <- subset(df,df$PLOT == "31B")
df_2 <- df[which(df$PLOT == "31B"),]
and if you want to add more conditions, u can always use "&"
df_3 <- df[which(df$PLOT == "31B" &
df$CO2S == 414),]