entries M
i1 : R = ZZ[x,y,z];
i2 : M = matrix{{x,z,x*y},{x^2+z,y*z,1}} o2 = | x z xy | | x2+z yz 1 | 2 3 o2 : Matrix R <-- R
i3 : entries M 2 o3 = {{x, z, x*y}, {x + z, y*z, 1}} o3 : List
i4 : N = mutableMatrix{{x,z,x*y},{x^2+z,y*z,1}} o4 = | x z xy | | x2+z yz 1 | o4 : MutableMatrix
i5 : entries N 2 o5 = {{x, z, x*y}, {x + z, y*z, 1}} o5 : List
The object entries is a method function.