[NumPy-Tickets] [NumPy] #2057: Invalid output shape from np.dot with matrixes
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Fri Feb 17 05:10:43 CST 2012
#2057: Invalid output shape from np.dot with matrixes
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Reporter: pv | Owner:
Type: defect | Status: new
Priority: normal | Milestone: Unscheduled
Component: numpy.matrixlib | Version: 1.6.1
Keywords: |
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http://permalink.gmane.org/gmane.comp.python.scientific.user/31095
Consider this:
{{{
import numpy as np
x = np.arange(5)
I = np.asmatrix(np.identity(5))
print np.dot(I, x).shape
# -> (1, 5)
}}}
while `(5, 1)` would be what is expected based on usual linear algebra
rules.
It might also be a mistake to return a matrix from mixed matrix--array
computations.
--
Ticket URL: <http://projects.scipy.org/numpy/ticket/2057>
NumPy <http://projects.scipy.org/numpy>
My example project
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