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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