On Jul 27, 12:42 pm, Peter Otten <__pete...@web.de> wrote: > Martin wrote: > > I am new to python and I was wondering if there was a way to speed up > > the way I index 2D arrays when I need to check two arrays > > simultaneously? My current implementations is (using numpy) something > > like the following... > > > for i in range(numrows): > > for j in range(numcols): > > > if array_1[i, j] == some_value or array_2[i, j] >= array_1[i, > > j] * some_other_value > > array_1[i, j] = some_new_value > > array_1[(array_1 == some_value) | (array_2 >= array_1 * some_other_value)] = > some_new_value > > maybe?
So I tried... band_1[(array_1 == 255) or (array_2 >= array_1 * factor)] = 0 which led to ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() so not sure that works? -- http://mail.python.org/mailman/listinfo/python-list