[Numpy-discussion] objects are not aligned. Matrix and Array
Wayne Watson
sierra_mtnview at sbcglobal.net
Sat Dec 19 00:20:59 EST 2009
This program gives me the message following it:
================Program==========
import numpy as np
from numpy import matrix
import 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))
r = math.sqrt(2*2+5*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)
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..
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)
(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet
"... humans'innate skills with numbers isn't much
better than that of rats and dolphins."
-- Stanislas Dehaene, neurosurgeon
Web Page: <www.speckledwithstars.net/>
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