[Numpy-discussion] recarray behaviour

[Jonathan Taylor]

I posted a message to this list about a weird recarray error (and sent a 
second one with the actual pickled data that failed for me).

Just wondering if anyone is/was able to reproduce this error. In 
recarray.py and recarrayII.py I have the exact same dtype description 
and try to create an array with the exact same list (their equality 
evaluates to True, and printed they are identical), but one raises an 
error, the other doesn't. Further, I can't use pdb to investigate the 
error...

I have another example (recarrayIII.py) that gives this same error and 
behaves rather unpythonically (if that really is a word....).

I couldn't figure out what was going on based on the recarray 
description in the numpy book.

=========================================

jtaylo at kff:~/Desktop$ python recarrayII.py
[(12.0, (2005, 4, 22, 0, 0, 0, 4, 112, -1), 501.0, 1.0, 2.0, 0.0, 0.0, 
1.0, 91.5, 1.0, 1.0, 87.0, 1.0, 129.0, 76.0, 107.0, 11.0), (24.0, (2005, 
2, 1, 0, 0, 0, 1, 32, -1), 504.0, 1.0, 2.0, 0.0, 0.0, 1.0, 166.0, 2.0, 
1.0, 84.0, 1.0, 128.0, 78.0, 401.0, 7.0)]
[('Week', '<f4'), ('Date', [('tm_year', '<i2'), ('tm_mon', '<i2'), 
('tm_mday', '<i2'), ('tm_hour', '<i2'), ('tm_min', '<i2'), ('tm_sec', 
'<i2'), ('tm_wday', '<i2'), ('tm_yday', '<i2'), ('tm_isdst', '<i2')]), 
('Institution', '<f4'), ('SeqNo', '<f4'), ('HeightDone', '<f4'), 
('Height', '<f4'), ('UnitsH', '<f4'), ('WeightDone', '<f4'), ('Weight', 
'<f4'), ('Units', '<f4'), ('PulseDone', '<f4'), ('Pulse', '<f4'), 
('BPdone', '<f4'), ('BPSys', '<f4'), ('BPDia', '<f4'), ('PID', '<f4'), 
('RN', '<f4')]
Traceback (most recent call last):
  File "recarrayII.py", line 8, in ?
    a = N.array(v[0:2], dtype=desc)
TypeError: expected a readable buffer object

=========================================
jtaylo at kff:~/Desktop$ python recarray.py
[(12.0, (2005, 4, 22, 0, 0, 0, 4, 112, -1), 501.0, 1.0, 2.0, 0.0, 0.0, 
1.0, 91.5, 1.0, 1.0, 87.0, 1.0, 129.0, 76.0, 107.0, 11.0), (24.0, (2005, 
2, 1, 0, 0, 0, 1, 32, -1), 504.0, 1.0, 2.0, 0.0, 0.0, 1.0, 166.0, 2.0, 
1.0, 84.0, 1.0, 128.0, 78.0, 401.0, 7.0)]
[('Week', '<f4'), ('Date', [('tm_year', '<i2'), ('tm_mon', '<i2'), 
('tm_mday', '<i2'), ('tm_hour', '<i2'), ('tm_min', '<i2'), ('tm_sec', 
'<i2'), ('tm_wday', '<i2'), ('tm_yday', '<i2'), ('tm_isdst', '<i2')]), 
('Institution', '<f4'), ('SeqNo', '<f4'), ('HeightDone', '<f4'), 
('Height', '<f4'), ('UnitsH', '<f4'), ('WeightDone', '<f4'), ('Weight', 
'<f4'), ('Units', '<f4'), ('PulseDone', '<f4'), ('Pulse', '<f4'), 
('BPdone', '<f4'), ('BPSys', '<f4'), ('BPDia', '<f4'), ('PID', '<f4'), 
('RN', '<f4')]
jtaylo at kff:~/Desktop$
========================================

jtaylo at kff:~/Desktop$ python recarrayIII.py
[(3.0,) (4.0,)]
Traceback (most recent call last):
  File "recarrayIII.py", line 6, in ?
    print N.array([[3],[4]], dtype=desc)
TypeError: expected a readable buffer object
jtaylo at kff:~/Desktop$
==========================================

Any help would be greatly appreciated,

Thanks,

Jonathan

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Jonathan Taylor                           Tel:   650.723.9230
Dept. of Statistics                       Fax:   650.725.8977
Sequoia Hall, 137                         www-stat.stanford.edu/~jtaylo
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