fill a column based on another one in R
Question
I have the following dt:
| col1 | col2. |
|---|---|
| A | 1 |
| A | 2 |
| B | 3 |
What I want is :
| col1 | col2. |
|---|---|
| A | 1 |
| A | 1 |
| B | 2 |
I tried many things but it didn't work for me? Does anyone have an idea how to do it?
1 answers
solution1
0 ACCPTED 2022-07-21 15:29:34
我们可以使用match
df1$col2 <- match(df1$col1, unique(df1$col1))
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