Martin wrote: > 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?
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