Hi Eliza,
May be this helps:
lapply(split(seq_len(nrow(AAA)),((seq_len(nrow(AAA))-1)%%12)+1),function(i)
AAA[i,])
A.K.
On Tuesday, May 27, 2014 6:48 PM, eliza botto <eliza_botto at hotmail.com>
wrote:
Dear R family,
I have this matrix say
AAA<-matrix(sample(1:240),ncol=2)
I first want to combine every 13th row in both columns. precisely, starting from
row-1 1,13,25,37,49,.... then starting from row-2
2,14,26,38,50 also 3,15,27,39,51 and similarly starting from row 4, row number
5, row 6... till 12th row,for both columns. so in a way
we will have list of 12 matrices each with 10 rows and 2 columns.
Finally, I want to calculate mean of each column of each matrix in that list,
while keeping the integrity of the list intact.
Kindly Advice!
Thankyou very much indeed in advance.
Eliza
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