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How to obtain the absolute difference between elements in a row?

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Grace
Grace 2014-8-17
编辑： Guillaume 2014-8-17
Hi I have
a= 4 3 2 1
4 3 1 2
4 2 3 1
I want to know the absolute difference between elements for each of the rows which gives me
b= 1 1 1
1 2 1
2 1 2
How am I going to do this? Thank you.

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Guillaume
Guillaume 2014-8-17
编辑：Guillaume 2014-8-17
b = abs(diff(a, 1, 2))

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