Running sum
Marc Schwartz wrote:
On Fri, 2004-11-19 at 16:44 -0600, hadley wickham wrote:
Perhaps I'm missing something, but isn't the maximum of the cumulative sum simply the last value, ie. sum(x)? Hadley
Indeed! And...going back to Sean's original post he did write: "I just need max(Y)." Thus, a whole group of us (independently) managed to over-engineer the solution. Presuming of course, that Sean does not require the entire cumulative sum vector for other purposes. I wonder what that says about human cognition.... Thanks, Marc <Cleaning his bi-focals...>
I have forgotten the details of the original question but it seems to me that if the elements of x could be both positive and negative then the maximum of the cumulative sum doesn't have to be the last sum.