It's very simple to write a "binit()" function. If all you want to do is e.g., bin 107 values into sums of 10 at a time, then write a loop that sums x[10*i:11*i-1] (not tested and not syntactically correct). The one I wrote for myself discards any partial bin (101-107 in my example) and leaves a warning note that this took place. Carl