15 Jul
2010
15 Jul
'10
4:45 p.m.
On Thu, Jul 15, 2010 at 9:38 AM, Emmanuel Bengio <bengioe@gmail.com> wrote:
Hello,
I have a list of 4x4 transformation matrices, that I want to "dot with" another list of the same size (elementwise). Making a for loop that calculates the dot product of each is extremely slow, I thought that maybe it's due to the fact that I have thousands of matrices and it's a python for loop and there's a high Python overhead.
I do something like this:
for a,b in izip(Rot,Trans): c.append(numpy.dot(a,b))
Is there a way to do this in one instruction? Or is there a way to do this all using weave.inline?
How about using list comprehension? And setting dot = numpy.dot. Would initializing the the c list first help?