Hi everyone, I tried to solve this problem but I could not find the
solution. I have about 105 matrices of equal size in the memory of**R, I
need to do is extract from these matrices some known positions and
create a new matrix with these columns. Show you an example with only
three matrices (but in my case I have hundreds of them).
A=matrix(1:15,5)
[,1] [,2] [,3]
[1,] 1 6 11
[2,] 2 7 12
[3,] 3 8 13
[4,] 4 9 14
[5,] 5 10 15
B=matrix(15:29,5)
[,1] [,2] [,3]
[1,] 15 20 25
[2,] 16 21 26
[3,] 17 22 27
[4,] 18 23 28
[5,] 19 24 29
C=matrix(30:44,5)
[,1] [,2] [,3]
[1,] 30 35 40
[2,] 31 36 41
[3,] 32 37 42
[4,] 33 38 43
[5,] 34 39 44
The positions I wish to extract are 1 and 5 of the first row of each
matrix (in my case are 25positions) and with this generate a new matrix
with the form
d=
[,1] [,2] [,3]
[1,] 1 15 30
[2,] 5 19 34
The ideais to builda loop toextract thisinformation from
hundredsmatrices, butI failed todo so.
Any helpwould be greatthank you very muchin advance
regards
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