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How to sum parts of an array

Question asked by WSTR on Nov 17, 2003
Latest reply on Nov 17, 2003 by mfredrik
I would like to sum only parts of the values of an array sum(array, istart) -> result = array[istart] + array[isart+1] .. + array[sweep_size(array)].

I appreciate any idea. Thank's Wolfram