r - 折叠成单行而不连接
问题描述
我的DF如下:
df <- structure(list(RID = c(1L, 1L, 2L, 2L, 3L, 3L),
Sex = c("FEMALE", "FEMALE", "MALE", "MALE", "FEMALE", "FEMALE"),
Race = c("White","White", "Hispanic", "Hispanic", "Black", "Black"),
TIME = c("Break Fast", "Break Fast", "Lunch", "Lunch", "Dinner", "Dinner"),
Sugar = c("Normal", "Normal", "Abnormal", "Abnormal", "Satisfactory",
"Satisfactory"),
Test_A = c(90L,"","" , 157L,"" , 129L),
Test_B = c("",90L , 157L,"", 129L,"" )),
class = "data.frame", row.names = c(NA, -6L))
所需的输出是:
Requd_df <- structure(list(RID = c(1L, 2L,3L),
Sex = c("FEMALE", "MALE", "FEMALE"),
Race = c("White", "Hispanic","Black"),
TIME = c("Break Fast", "Lunch", "Dinner"),
Sugar = c("Normal", "Abnormal", "Satisfactory"),
Test_A = c(90L, 157L, 129L),
Test_B = c(90L , 157L, 129L)),
class = "data.frame", row.names = c(NA, -3L))
我的代码如下:
setDT(df)
df1 <- df[, lapply(.SD, paste0, collapse=""), by= RID]
我的代码连接列的每个元素——RID、Sex、Race、Time、Sugar。需要在没有连接的情况下折叠请帮助
解决方案
包括其他变量by
-
library(data.table)
setDT(df)
df[, lapply(.SD, paste0, collapse=""), .(RID, Sex, Race, TIME, Sugar)]
# RID Sex Race TIME Sugar Test_A Test_B
#1: 1 FEMALE White Break Fast Normal 90 90
#2: 2 MALE Hispanic Lunch Abnormal 157 157
#3: 3 FEMALE Black Dinner Satisfactory 129 129
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