我想从一个 Dataframe 写单独的csv,但是csv应该以一个分组变量命名,并且只包含3个特定的列(可能有很多列)。有人有什么提示吗?
这里是一个最小的例子。我想做的是为每个 subject_nr 写一个csv(命名为“101.csv”,“102.csv”等),其中csv只包含相关 subject_nr 的 item,start_time 和 end_time 列。
df <- data.frame("subject_nr" = c("101", "101", "101", "102", "102", "103", "103", "103"),
"item" = c("a", "b", "c", "a", "b", "a", "b", "c"),
"start_time" = c(50, 52, 55, 53, 54.5, 12, 15, 17),
"end_time" = c(51, 54, 60, 53.5, 55.5, 14, 16.5, 19),
"extra_variable"= c("s", "t", "u", "v", "w", "x", "y", "z"))
例如,第一个 subject_nr(101)的结果csv(“101.csv”)应如下所示(没有行号或类似内容):
"item","start_time","end_time"
"a",50,51
"b",52,54
"c",55,60
1条答案
按热度按时间qoefvg9y1#