Given a matrix of MxN
want to take the means of rows in the following fashion
m<-matrix(seq(1,80),ncol=20, nrow=4)
result<-matrix(NA,nrow=4,ncol=20/5)
result[,1]<-apply(m[,1:5],1,mean)
result[,2]<-apply(m[,6:10],1,mean)
result[,3]<-apply(m[,11:15],1,mean)
result[,4]<-apply(m[,16:20],1,mean)
result
[,1] [,2] [,3] [,4]
[1,] 9 29 49 69
[2,] 10 30 50 70
[3,] 11 31 51 71
[4,] 12 32 52 72
So, I want the mean of every successive 5 values in a row
as the dimension in columns is wide I cant write it with multiple apply as
above
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