In a method for establishing a machine code which can be immediately executed by a computer, the execution of which causes the computer to implement a rolling model and to determine an output variable that quantitatively describes at least one material flow occurring in the rolling stock during a rolling process defined by the condition of the rolling stock and the roll stand setting. The output variable is determined on the basis of the rolling model, a rolling stock condition lying within a predetermined range of conditions, and a roll stand setting lying within a predetermined range of settings. Furthermore, a computer program, a data carrier, a computer, and a rolling train with at least one roll stand are disclosed.