Hi -- I have noticed a change in the behavior of numpy.flatten(True) between NumPy 1.0.4 and NumPy 1.1. The change affects 3D arrays. I am wondering if this is a bug or a feature. Here's the change. Note that the output from flatten(True) is different between 1.0.4 and 1.1. ======= First the preliminary set up: ======= In [3]: A = numpy.array([[[1, 2], [3, 4]], [[5, 6], [7, 8]], [[9, 10], [11, 12]]]) In [4]: A Out[4]: array([[[ 1, 2], [ 3, 4]], [[ 5, 6], [ 7, 8]], [[ 9, 10], [11, 12]]]) ======= Now the change: Numpy 1.0.4 ======= In [5]: A.flatten() Out[5]: array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]) In [6]: A.flatten(True) Out[6]: array([ 1, 5, 9, 2, 6, 10, 3, 7, 11, 4, 8, 12]) ======= Numpy 1.1 ======= In [4]: A.flatten() Out[4]: array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]) In [5]: A.flatten(True) Out[5]: array([ 1, 5, 9, 3, 7, 11, 2, 6, 10, 4, 8, 12]) Note that the output of A.flatten(True) is different. Is this a bug or a feature? Cheers, Stuart Brorson Interactive Supercomputing, inc. 135 Beaver Street | Waltham | MA | 02452 | USA http://www.interactivesupercomputing.com/