We have the following data frame a with something like this:
> a
google_prod Value
1 categoria ML
2 google 120
3 youtube 24
4 categoria AO
5 google 2
6 youtube 0
7 categoria ML
8 google 27
9 youtube 0
10 categoria AO
11 google 5
12 youtube 0
We would like to get this:
categoria google_prod Value
1 ML google 120
2 ML youtube 24
3 AO google 2
4 AO youtube 0
5 ML google 27
6 ML youtube 0
7 AO google 5
8 AO youtube 0
In other words, perform a type of application of the Spread or similar function, where only one value is taken from the google_prod column to apply it, in this case it would be the 'categoria' value.