| ring r=32003,(x,y,z),dp;
matrix(x);
==> _[1,1]=x
matrix(x, 1, 2);
==> _[1,1]=x
==> _[1,2]=0
matrix(intmat(intvec(1,2,3,4), 2, 2));
==> _[1,1]=1
==> _[1,2]=2
==> _[2,1]=3
==> _[2,2]=4
matrix(_, 2, 3);
==> _[1,1]=1
==> _[1,2]=2
==> _[1,3]=0
==> _[2,1]=3
==> _[2,2]=4
==> _[2,3]=0
matrix(_, 2, 1);
==> _[1,1]=1
==> _[2,1]=3
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