Change in diff function

Hey, diff function takes difference of successive elements. How to change the function to take difference in a way that we skip successor element and take difference with next element of successor. Eg X(3)-X(1) , X(4)-X(2) , X(5)-X(3) and so on Note: diff of 2d array is being taken.

Answer 1

[Guillaume]

You can't change the diff function, but it is trivial to implement your difference:

result = X(3:end) - X(1:end-2)

For a 2D array, you need to apply the indexing to the correct dimension, e.g. for difference between rows:

result = X(3:end, :) - X(1:end-2, :)

[Fatima Rashid]

Thankyou, what about if we need to apply same thing on an image.

[Guillaume]

An image is a matrix like any other, you can do exactly the same.