How to set crop boundary

How do i add a boundary condition in matlab ? Like my image is 100 x 100 and i want to crop 1000 x 1000.

So new = old(1:1000,1:1000).

But that will give me an error. How can I add in a boundary condition so it restricts my range ? Like

new = old(1:1000,1:1000) & boundary (openCV got & function to take intersection between 2 rectangles)

Answer 1

[Image Analyst]

Simply use an "if" statement to see if the column is more than the number of columns in your image

rightColumn = 1000;
[rows, columns, numColors] = size(old);
if rightColumn > columns
    rightColumn = columns;
end