matlab计算差分函数diff

A =

3 2 5 6
5 2 1 8
4 2 7 9

>> diff(A,1,1)

ans =

2 0 -4 2
-1 0 6 1

>> diff(A,1,2)

ans =

-1 3 1
-3 -1 7
-2 5 2

>> diff(A,2,1)

ans =

-3 0 10 -1

>> diff(A,2,2)

ans =

4 -2
2 8
7 -3