[Numpy-discussion] ValueError: objects are not aligned

Rui DaCosta ruidc@yahoo....
Wed Sep 8 07:08:20 CDT 2010


Thanks for your assistance,

I was following this example:
http://www.scipy.org/Numpy_Example_List#head-779283aaa3cc20a3786ad33c2ee1fee9d68a4a53



I intend to use different arrays once I have resolved this problem.

Trying your suggestion:
...
print (rf1)
print (np.corrcoef(rf1, rf1, rowvar=0))

results in:

[[-0.00641625]
[-0.00498411]
[-0.0038015 ]]
[[ 1.  1.]
[ 1.  1.]]


which should have been a 3x3 matrix

as for "stacking rf1 rf1 into a single array first" how would I do this?

Regards,
Rui



________________________________
From: "josef.pktd@gmail.com" <josef.pktd@gmail.com>
To: Discussion of Numerical Python <numpy-discussion@scipy.org>
Sent: Wed, September 8, 2010 1:09:46 PM
Subject: Re: [Numpy-discussion] ValueError: objects are not aligned

On Wed, Sep 8, 2010 at 5:42 AM, RuiDC <ruidc@yahoo.com> wrote:
>
> I'm getting this error, which must be a simple error in getting the result
> from the cursor in the right shape, how do I get the cursor into the array
> as a single dimension?:
>
>    import numpy as np
>    import sqlite3
>    conn = sqlite3.connect("simpledb")
>    cursor1 = conn.execute("select LogReturn from tblReturns limit 3")
>    rf1 = np.asarray(cursor1.fetchall(), dtype=np.float64)
>    print (rf1)
>    print (np.corrcoef([rf1, rf1]))

numpy.corrcoef(x, y=None, rowvar=1, bias=0)

try
np.corrcoef(rf1, rf1, rowvar=0)   no [ ]
or
stacking rf1 rf1 into a single array first

Josef

>
> result:
> [[-0.00641625]
>  [-0.00498411]
>  [-0.0038015 ]]
> Traceback (most recent call last):
>  File "C:\Documents and Settings\rui\workspace\numpytest\src\numpytest.py",
> line 38, in <module>
>    print (np.corrcoef([rf1, rf1]))
>  File "C:\Python26\lib\site-packages\numpy\lib\function_base.py", line
> 2003, in corrcoef
>    c = cov(x, y, rowvar, bias, ddof)
>  File "C:\Python26\lib\site-packages\numpy\lib\function_base.py", line
> 1953, in cov
>    return (dot(X, X.T.conj()) / fact).squeeze()
> --
> View this message in context: 
>http://old.nabble.com/ValueError%3A-objects-are-not-aligned-tp29641661p29641661.html
>
> Sent from the Numpy-discussion mailing list archive at Nabble.com.
>
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