hello,
 
I would like to do a for loop for matrix:
 
Xm             Xm-1   ......      X1
Xm+1         Xm      ......      X2
.......................................
.....................................
Xn              Xn-1    ......      Xn-m+1
 
How can I do  it in R?
 
Thanks!!!
 
 


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