The ornamental design for a userinterface for a machine, as shown and described.
FIG. 1 is a front perspective view of the design for a user interface for a machine;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a front perspective view of the design for a user interface for a machine showing the user interface mounted on a machine, to illustrate a typical environment in which the user interface would be used.
In these drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate environmental features that form no part of the claimed ornamental design.