The ornamental design for a pattern for a laptopcomputer, as shown and described.
The FIGURE is a top plan view of a pattern for a laptop computer showing a plurality of full or partial heart-like patterns with bean-shapes inside, each pattern being of a different size and scattered on the computer.
The outer most contour line of the computer shown in broken lines indicates the bounds of the claimed design and all other broken lines illustrate portions of the laptop computer, and form no part of the claimed design.