Hello,
I have a big problem which Im 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]
$`14` ###########==project_id
[1] 3.933333 #######==mean value
> dim (mean_rating)
[1] 2214
I want to separate now the project_id from the mean value. So that I have
two separate columns (2 dimension).
How can I separate a ragged array into two variables?
*Additional information:*
I need this information to put the mean value into another dataset
(projok) at the correct project_id.
I would do that as follow:
k=projok[,1]
for(i in 1:2442) {
projLineNb = which(mean_rating$project_id==k[i])
projok$mean[i] = mean_rating$value[projLineNb]
}
But with a ragged array I can not refer to project_id. Or is there a
possibility that I can refer to the project_id in a ragged array?
> mean_rating [[1]]
[1] 3.933333 ==I can refer to the value only
Thank you very much
Best,
Helene
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