On Fri, Dec 18, 2009 at 10:20 PM, Wayne Watson <sierra_mtnview@sbcglobal.net
wrote:
This program gives me the message following it: ================Program========== import numpy as np from numpy import matrix import math
You don't want math.
def sinD(D): # given in degrees, convert to radians return math.sin(math.radians(D)) def cosD(D): return math.cos(math.radians(D))
def sinD(D): return np.sin(np.deg2rad(D))
r = math.sqrt(2*2+5*5)
np.hypot(2, 5)
print r m1 = matrix([[2], [5]]) print "m1: ", m1
theta = 5.0 # degrees #CW 2x2 clockwise matrix rotCW = matrix([ [cosD(theta), sinD(theta)], [-sinD(theta), cosD(theta)] ])
print rotCW
m2 = rotCW*m1 print "m2: ", m2 print "aaaaaaaa: ", type(m1), type(m2) m1=np.array(m1) m2=np.array(m2)
print "zzzzzzzz: ", type(m1), type(m2)
print"dot, ..." dotres = np.dot(m1,m2)
Try np.dot(m2, m1), m1 is a column matrix.
print "dotres", dotres ==============end==========
==========Output msgs======== 5.38516480713 m1: [[2] [5]] [[ 0.9961947 0.08715574] [-0.08715574 0.9961947 ]] m2: [[ 2.42816811] [ 4.806662 ]] aaaaaaaa: <class 'numpy.core.defmatrix.matrix'> <class 'numpy.core.defmatrix.matrix'> zzzzzzzz: <type 'numpy.ndarray'> <type 'numpy.ndarray'> dot, ...
Traceback (most recent call last): File
"C:/Sponsor_Meteors/Sentinel_Development/Development_Sentuser+Utilities/Playground/junk.py", line 30, in <module> dotres = np.dot(m1,m2) ValueError: objects are not aligned ================end msgs=========== Why the msg? The types look alike and each array/matrix contains two elements..
Chuck