Hi,

I am trying to create matrices X's based on one indicator variable, r.

Given a 4 x4 matrix X= [ 0,0,0,0
                                        0,0,0,0
                                        0,0,0,0
                                        0,0,0,1]
r= c(0, 0, 0, 1)

I'd like to create separate matrices where
when i = 1, X= [1,0,0,0
                          0,0,0,0
                          0,0,0,0
                          0,0,0,1]

when i =2 , X= [0,0,0,0
                         0,1,0,0
                         0,0,0,0
                         0,0,0,1]

when i = 3, X=  [0,0,0,0
                          0,0,0,0
                          0,0,1,0
                          0,0,0,1]

when i = 4, X=  [0,0,0,0 
                          0,0,0,0
                          0,0,0,0
                          0,0,0,1]

Any suggestions would be very appreciated.

Thanks


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