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How to transform the data with id and count into one column? [duplicate]
My data is
ID n
1 3
2 2
3 4
I want it to be like
ID
1
1
1
2
2
3
3
3
3
The only way I can solve it is that I use for loop.
Below is my code
y <- read.csv('Desktop/勞研所/20220831 攜出/py.csv')
data ...
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