Alternatives to using diff(X,2)

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AtoZ
AtoZ 2018-12-8
评论： Bruno Luong 2018-12-8
Just a simple question:
We have an alternative for the opreation diff(A,1) given by A(2:end)-A(1:end-1), from an earlier post.
How to generalize it for diff(A,2)? for say A=[1 2 3 4 5 6]? to get [0 0 0 0].
Thanks.

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Bruno Luong
Bruno Luong 2018-12-8
编辑：Bruno Luong 2018-12-8
Just apply the same method twice
D1 = A(2:end)-A(1:end-1);
D2 = D1(2:end)-D1(1:end-1)
or
D2 = conv(A,[1 -2 1],'valid')
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AtoZ
AtoZ 2018-12-8
编辑：AtoZ 2018-12-8
Does it also work for sym type inputs? the conv(..) thing gives error for sym type input while the D2 prescription works.
Bruno Luong
Bruno Luong 2018-12-8
No this is numerical difference method

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