[Numpy-discussion] Matrix addition, +=

2011-09-12 Thread Jonas Wallin
Hello, I am sure this question has been answered before but I can't find the right search word to find it. Why does MuY += MuY.transpose() and MuY = MuY + MuY.transpose() give different answers? thanks /Jonas Wallin ___ NumPy-Discussion

Re: [Numpy-discussion] Matrix addition, +=

2011-09-12 Thread Alan G Isaac
On 9/12/2011 7:18 AM, Jonas Wallin wrote: Why does MuY += MuY.transpose() and MuY = MuY + MuY.transpose() give different answers? Because the first one is done in-place, so you are changing MuY (and thus MuY.transpose) as the operation proceeds. MuY.transpose() is generally a