matrix(Ring,List)

matrix(R,v) -- create a matrix over R from a doubly-nested list of ring elements or matrices.

This is essentially the same as matrix(List) together with the specification of the ring.

     i1 = R = ZZ/101[a..f]
     
     o1 = R
     
     o1 : PolynomialRing

     i2 = matrix(R, {{a,b,0},{d,0,f}})
     
     o2 = | a b 0 |
          | d 0 f |
     
                  2       3
     o2 : Matrix R  <--- R