The ornamental design for a frame for slidingdoors and walls, as shown and described.
FIG. 1 is a perspective view of the top, front and left side of a frame for sliding doors and walls showing my new design according to a third embodiment;
FIG. 2 is a second perspective view of the bottom, rear and left side thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a left side elevational view thereof.
The claimed design has been broken in the center to indicate indefinite length.