r - How to make a matrix from a given vector by using for loop -

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I try to retrieve $ n \ times 4 $ matrix to Since I am new to the R , how to use the loop function properly.

My code is such as 

  x   
 However, I found: Error in  x1 [1 + i, 4 + i]: Wrong number of dimensions.   
 I have to add this also to the  ai  in the matrix and  ii1 / th  of each  ai  matrix. The row will be. Seems that I should use the cbind function?  
 Any help would be appreciated. Thanks in advance.   
 
 
 It may help:  
  n & lt ; - Length (x1) -1 race and lieutenant; - SPELE ((4: n) -3, function (i) x1 [(i + 3): i]) dim (ridge) # [1] 4 150

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