RCUMSUM cumulative sum of elements, restarted after every zero. For vectors, RCUMSUM(X) is a vector containing the cumulative sum of the elements of X, with the summation restarting after a zero is encountered. For matrices, RCUMSUM(X) is a matrix the same size as X containing the cumulative restarted sums over each column. For N-D arrays, RCUMSUM(X) operates along the first non-singleton dimension.
RCUMSUM(X,DIM) works along the dimension DIM.
Also included is RCUMPROD.
For bug reports, please email me.