genericMatrix

genericMatrix(R,x,m,n) -- produce an m by n matrix of variables drawn from the ring R, starting with variable x. 

     i1 = R = ZZ/101[a..d]
     
     o1 = R
     
     o1 : PolynomialRing
     
     i2 = genericMatrix(R,a,2,2)
     
     o2 = | a c |
          | b d |
     
                  2       2
     o2 : Matrix R  <--- R

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