MATLAB: Strange behavior of diff()

2012diff()

Hi all,
I'm using 2012b and I'm trying to find the difference between successive elements of a vector of uint64 numbers. Here's some of them, but I get very puzzling results form diff(). For instance:
a =       [4648759972
           4648759972
           4651621722
           4652352784
           4652733003
           4653926753]
Then diff(a) gives the wrong result:
               [5166781
                5166781
                2305031
                1573969
                1193750]
However diff(a(1:2)) gives the correct result: 0. Also diff(a(2:3)) gives the correct result: 2861750
I've been searching for an explanation but I did not find a similar problem ever reported, and I don't understand what is happening. Can anybody explain to me what is going on here?
Thanks a lot!
Paul

Best Answer

Problem solved; external diff function caused bad behavior; deleting this external function solved the problem.
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