[Numpy-discussion] numarray.linear_algrebra > cholesky_decomposition problem

Justin Worrall Justin.Worrall at morganstanley.com
Fri Aug 29 01:05:05 CDT 2003


Hi,

I'm having problems using the cholesky decomposition function - perhaps
someone could point out where I am going wrong. Many thanks,

Justin

dingy /ms/user/w/worrall 22$ python
Python 2.3 (#1, Aug 19 2003, 16:53:06)
[GCC 2.95.2 19991024 (release)] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> from numarray import *
>>> from numarray.linear_algebra import *
>>> x=array([[1.0,0.0],[0.5,1.0]])
>>> x
array([[ 1. ,  0. ],
       [ 0.5,  1. ]])
>>> cholesky_decomposition(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File
"/u/worrall/Python-2.3/numarray/linear_algebra/LinearAlgebra2.py", line
159, in cholesky_decomposition
    return copy.copy(num.transpose(mlab.triu(a,k=0)))
  File "/u/worrall/Python-2.3/numarray/linear_algebra/mlab.py", line
134, in triu
    svsp = m.spacesaver()
AttributeError: 'NumArray' object has no attribute 'spacesaver'
>>>

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