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schleyer
2011 Oct 16
2
question: ragged array
Hello,
I have a big problem which I’m just not able to solve.
I created the following mean value from the following dataset structure:
Id |value
1 | 2
1 | 3
1 | 4
2 | 2
2 | 1
3 | 5
4 | 3
etc.|etc.
with the command:
mean_rating <- tapply(ratok$value, ratok$project_id , mean,simplify = FALSE)
this gives me a ragged array:
> mean_rating [1]
$`14`