[英]How can I split a dataframe into odd and even years?
I have a dataframe of this format: 我有这种格式的数据框:
19620101 1 2 4
19630102 6 2 3
19640103 0 2 3
19650104 0 1 3
I want to split and store it into two variables/dataframes based on whether the year is even or odd. 我想根据年份是偶数还是奇数将它拆分并存储到两个变量/数据帧中。
So basically, one dataframe/variable will have even years 所以基本上,一个数据帧/变量甚至会有几年
19620101 1 2 4
19640103 0 2 3
While another will have odd years: 而另一个将有奇数年:
19630102 6 2 3
19650104 0 1 3
How can I do this? 我怎样才能做到这一点?
> split(df, floor(df[[1]] / 1e4) %% 2 == 0)
$`FALSE`
V1 V2 V3 V4
2 19630102 6 2 3
4 19650104 0 1 3
$`TRUE`
V1 V2 V3 V4
1 19620101 1 2 4
3 19640103 0 2 3
If year is stored in four first characters of the first column, then 如果年份存储在第一列的四个第一个字符中,那么
split(d,as.numeric(substr(d$V1,1,4))%%2==0)
where d
is a data.frame: 其中d
是data.frame:
> d
V1 V2 V3 V4
1 19620101 1 2 4
2 19630102 6 2 3
3 19640103 0 2 3
4 19650104 0 1 3
> dput(d)
structure(list(V1 = c(19620101L, 19630102L, 19640103L, 19650104L
), V2 = c(1L, 6L, 0L, 0L), V3 = c(2L, 2L, 2L, 1L), V4 = c(4L,
3L, 3L, 3L)), .Names = c("V1", "V2", "V3", "V4"), class = "data.frame", row.names = c(NA,
-4L))
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