 Usage:  y = diagrv(x,v)  
 
 Input:

  x                      N x K matrix 
                         
  v                      nk x 1 vector, where nk is min(N,K) 
                         
 Output:

  y                      N x K matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
