Displaying 1 result from an estimated 1 matches for "4460x3500".
2005 Jan 14
3
summing subsets of rows matrices
I have a large data matrix (4460X3500) and I want to sum row subsets in groups of 10 (bin). Is there an efficient way to do this in R without using loops. Looping takes forever to perform this task!
For example suppose we have the matrix
> matrix(1:12,6,2)
[,1] [,2]
[1,] 1 7
[2,] 2 8
[3,] 3 9
[4,] 4 10
[...