Wow, there are a lot of possibilities... thank you all very much!!!
I guess, I'll go for "as.data.frame.table", because it's one line and does
exactly what I want :-)
Ciao,
Antje
Antje schrieb:
Hello,
I have a question how to reshape a given matrix to a data frame.
# ----------------------------------
> a <- matrix(1:25, nrow=5)
> a
[,1] [,2] [,3] [,4] [,5]
[1,] 1 6 11 16 21
[2,] 2 7 12 17 22
[3,] 3 8 13 18 23
[4,] 4 9 14 19 24
[5,] 5 10 15 20 25
> colnames(a) <- LETTERS[1:5]
> rownames(a) <- as.character(1:5)
> a
A B C D E
1 1 6 11 16 21
2 2 7 12 17 22
3 3 8 13 18 23
4 4 9 14 19 24
5 5 10 15 20 25
# -----------------------------------
This is an example on how my matrix looks like.
Now, I'd like to reshape the data that I get a data frame with three
columns:
- the row name of the enty (X1)
- the column name of the entry (X2)
- the entry itself (X3)
like:
X1 X2 X3
1 A 1
2 A 2
3 A 3
....
1 B 6
2 B 7
....
5 E 25
How would you solve this problem in an elegant way?
Antje
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and provide commented, minimal, self-contained, reproducible code.
