r - 从数据框中的列中添加和减去值
问题描述
我有一个数据框如下:
+-----+---------+-----+-----+-----------------+----------+----------+------------+
| ID | CURRENT | JAN | FEB | CURRENT_IN_2018 | JAN_2018 | FEB_2018 | UNITS_SWAP |
+-----+---------+-----+-----+-----------------+----------+----------+------------+
| 123 | 2 | 3 | 4 | 5 | 6 | 7 | 12 |
| 456 | 1 | 5 | 0 | 4 | 8 | 6 | 6 |
+-----+---------+-----+-----+-----------------+----------+----------+------------+
我在这里尝试做的是从 中减去数字UNITS_SWAP
,CURRENT_IN_2018
然后JAN_2018
依次FEB_2018
直到 UNITS_SWAP 中的数字达到零。同样在执行此操作时,UNITS_SWAP
将从每行减去的数量添加到它们各自的匹配行中,例如,如果从 current_in_2018 中减去 5 个单位,则在 CURRENT 中添加 5 个单位,依此类推,对于 JAN 和 FEB,最终结果为如下:
+-----+---------+-----+-----+-----------------+----------+----------+------------+
| ID | CURRENT | JAN | FEB | CURRENT_IN_2018 | JAN_2018 | FEB_2018 | UNITS_SWAP |
+-----+---------+-----+-----+-----------------+----------+----------+------------+
| 123 | 7 | 9 | 5 | 0 | 0 | 6 | 0 |
| 456 | 5 | 7 | 0 | 0 | 6 | 6 | 0 |
+-----+---------+-----+-----+-----------------+----------+----------+------------+
加载数据的脚本:
DF <- data.frame(ID = c(123,456),
CURRENT = c(2,1),
JAN = c(3,5),
FEB=c(4,0),
CURRENT_2018 = c(5,4),
JAN_2018 = c(6,8),
FEB_2018=c(7,6),
UNITS_SWAP =c(12,6))
解决方案
您可以这样做 - 尽管请注意它会覆盖您的源 DF:
cols <- c('CURRENT', 'JAN', 'FEB')
for (i in 1:NROW(DF)) {
while (DF[i, 'UNITS_SWAP'] > 0) {
for (col in cols) {
excess <- min(DF[i,'UNITS_SWAP'], DF[i, paste0(col, '_2018')])
DF[i, col] <- DF[i, col] + excess
DF[i, paste0(col, '_2018')] <- DF[i, paste0(col, '_2018')] - excess
DF[i, 'UNITS_SWAP'] <- DF[i, 'UNITS_SWAP'] - excess
}
}
}
因为你的列有明确的结构(column
matching column_2018
),我们只需要按照你指定的顺序遍历它们,然后粘贴_2018
就可以得到相关的匹配列。