[Numpy-discussion] Faster way to generate a rotation matrix?
Sturla Molden
sturla@molden...
Wed Mar 4 06:18:35 CST 2009
On 3/4/2009 7:50 AM, Hoyt Koepke wrote:
> In cython, the above would be (something like):
It also helps to turn off bounds checks:
from numpy cimport ndarray
cdef extern from "math.h":
double cos(double)
double sin(double)
@cython.boundscheck(False)
cpdef ndarray[double, ndim=2] rotation(ndarry[double] theta,
ndarray[double, ndim=2] R = np.zeros((3,3))):
cdef double cx = cos(theta[0]), \
cy = cos(theta[1]), \
cz = cos(theta[2])
cdef double sx = sin(theta[0]), \
sy = sin(theta[1]), \
sz = sin(theta[2])
R[0,0] = cx*cz - sx*cy*sz
R[0,1] = cx*sz + sx*cy*cz
R[0,2] = sx*sy
...
R[2,2] = cy
return R
S.M.
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