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Inverse/opposite of diff function?

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Gregor Lees
Gregor Lees on 9 Feb 2016
Edited: Kristopher Anderson on 24 Nov 2017
I have a 480x640 matrix and would like to perform the diff function on the elements but instead of subtracting the previous element I would like to add it.
I have tried using x(2:end) + x(1:end-1) Which return the right values but instead of returning a 479x640 matrix it returns a 1x307199 matrix. How can I change the function to give the 479x640 matrix.
Thanks in advance

Accepted Answer

Torsten
Torsten on 9 Feb 2016
x(1:end-1,:) + x(2:end,:)
Best wishes
Torsten.

More Answers (1)

Kristopher Anderson
Kristopher Anderson on 24 Nov 2017
Edited: Kristopher Anderson on 24 Nov 2017
The opposite of diff is cumsum.
Example:
>> A = randi([1,5],1,5)
A =
1 3 5 2 1
>> B = diff(A)
B =
2 2 -3 -1
>> C = cumsum([A(1) B])
C =
1 3 5 2 1

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