summation of diffrent lengths in vector

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Sakhr
Sakhr 2011-10-12
I would like to sum some lengths in vector. For example I have a=[0.0 0.0 0.3 0.4 0.5 0.0 0.0 0.0 0.0 1.0 1.1]. I need b=((0.5-0.3)+(1.1-1.0))=0.3. The time step is constant=0.1 and this order of elements can be change in new run of the program.Thanks alot.

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Clemens
Clemens 2011-10-12
I would do this with some logical indexing magic.
a=[0.0 0.0 0.3 0.4 0.5 0.0 0.0 0.0 0.0 1.0 1.1];
step = 0.1;
tmp = a>0; % rule what elements to take
i_sum = tmp(1:end-1) & tmp(2:end)>0; % magic removes 1 element from each group
distances = sum((i_sum))* step % = 0.3

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