Sheldon <[EMAIL PROTECTED]> wrote: > I have two arrays that are of the same dimension but having 3 different > values: 255, 1 or 2. > I would like to set all the positions in both arrays having 255 to be > equal, i.e., where one array has 255, I set the same elements in the > other array to 255 and visa versa. Does anyone know how to do this > without using for loops?
Python's Numeric extension package (still available, but not actively developed any more) and its successors (numarray, and the even newer numpy) are replete with such functionality -- indeed, to really use arrays in Python you should get any one of these packages (Python offers arrays only in the very limited incarnation of the standard library module named array -- better than nothing, but little built-in functionality, while those packages have plenty). Of course, if you say "array" when actually you mean "list", the situation is completely different (it may be worth turning list into Numeric arrays for manipulation, then back when you're done, if speed is absolutely of the essence and you desperately need lists as inputs and outputs but a lot of manipulation in-between). Alex -- http://mail.python.org/mailman/listinfo/python-list