0 个投票

I need a way to do what diff does but ignore differences when the upper bound or lower bound is 0;
X = [1 1 2 0 5 0 13 21];
Y = diff(X)
Y =
0 1 -2 5 -5 13 8
X = [1 1 2 0 5 0 13 21];
Y = the_diff_I_Need(X)
Y =
0 1 0 0 0 0 8
Efficiency is important here.
Thanks

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dpb
dpb 2017-7-21
编辑：dpb 2017-7-21

1 个投票

X(X==0)=nan; % flag zero locations
d=diff(X); % compute difference w/ flagged
d(isnan(d))=0; % replace NaN in output if desired
For the sample given
>> Y=X;Y(Y==0)=nan;
>> d=diff(Y); d(isnan(d))=0
d =
0 1 0 0 0 0 8
>>

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