Change in diff function

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Fatima Rashid
Fatima Rashid 2019-7-9
评论： Guillaume 2019-7-10
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.

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Guillaume
Guillaume 2019-7-9
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, :)
  2 个评论
Fatima Rashid
Fatima Rashid 2019-7-9
Thankyou, what about if we need to apply same thing on an image.
Guillaume
Guillaume 2019-7-10
An image is a matrix like any other, you can do exactly the same.

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