How to return an empty matrix?

Considering an image of size 100 X 280. A binary mask of size 7X4. when masking the image with this mask, At the end, Im getting an error that Index exceeds matrix dimensions. For that What can I do? Can I return an empty matrix? If it is possible, how?

Answer 1

[Walter Roberson]

YourVariable = [];  %this is an empty matrix

[Sabarinathan Vadivelu]

How to mask an image size of 512 X 512 with a mask of size 5X5?