MATLAB: Create a array base on specific condition

matrix array

I had a array like this
A=[0 0 0 10 0 0 0 0 8 0 0 5 0 0 0 3 0 2 0 0 0 1 0 0 0];
and now I want to create a array B like this in which
B(4)=10-8=2;
[B(4)=A(4)-next upcoming non zero value ],
B(9)=8-5=3;[B(9)=A(9)-next non zero value]
and similarly for
B(12)=5-3=2;
B(16)=3-2=1;
B(18)=2-1=1;
B(22)=1;
and rest of the B values are zero. thanks

Best Answer

>> idx = A~=0;
>> A(idx) = [-diff(A(idx)),1]
A =
   0   0   0   2   0   0   0   0   3   0   0   2   0   0   0   1   0   1   0   0   0   1   0   0   0
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