//@code
objref m
m = new Matrix(4,6)
for i=0,m.nrow-1 for j=0,m.ncol-1 m.x[i][j] = 1 + 10*i + j
m.printf
m.bcopy(1,2,2,3).printf
m.bcopy(1,2,2,3,2,3).printf
m.bcopy(1,2,2,3,2,3, new Matrix(8,8)).printf