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modified cumsum for partial accumulated sums

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Determine the accumulated sum of series of non-zero values of vectors, resetting at zero entries

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This is a modified version of cumsum, where the accumulated sum is determined along the first non-singleton direction of an input tensor "arr". The accumulated sums are stored in the output tensor "val" at locations of the zeros of arr.

 [val, ind] = cumsum_restart0( arr, dim )
 if dim is not defined, use first non-singleton dimension
 val is the cumulative sum, where the accumulation is reset for zero
 entries
 ind indicates the locations where the acummulated sum is stored
 
 example:
 arr = [3 1 1 0 1 2]';
 [val, ind] = cum_sum_restart0( arr );
 val = [0 0 5 0 0 3]'
 ind = [0 0 1 0 0 1]'
 
 3/20/13
 koehler.s.a@gmail.com

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