weird behavior. bug perhaps?

[zoom]

On 06/18/2013 04:27 PM, rusi wrote:
> On Jun 18, 7:23 pm, zoom<z... at yahoo.com>  wrote:
>> Hi, I have a strange problem here. Perhaps someone would care to help me.
>>
>> In the file test.py I have the following code:
>>
>> from scipy import matrix, tile, mean, shape
>> import unittest
>>
>> class TestSequenceFunctions(unittest.TestCase):
>>
>>       def setUp(self):
>>           self.m = [[1,2],[3,4],[3,4],[3,4]]
>>
>>       def test_simplify(self):
>>           m = matrix(self.m)
>>           print shape(m)
>>           print [shape(m)[1],1]
>>           print shape(tile(mean(m,1),[shape(m)[1],1]).T)
>>
>> if __name__ == '__main__':
>>       unittest.main()
>>
>> (Note that test.py, is just a simplification of my testing file,
>> sufficient to reproduce the weird behavior that I'm  about to describe.)
>>
>> If i run it in terminal via "python test.py" command I get the following
>> output:
>>
>> (4, 2)
>> [2, 1]
>> (1, 8)
>> .
>> ----------------------------------------------------------------------
>> Ran 1 test in 0.000s
>>
>> OK
>>
>> Now comes the funny part.
>> Let's try to run the following code in python interpreter:
>>
>>   >>>  m = [[1,2],[3,4],[3,4],[3,4]]
>>   >>>
>>   >>>  from scipy import matrix, tile, mean, shape
>>   >>>  print shape(m)
>> (4, 2)
>>   >>>  print [shape(m)[1],1]
>> [2, 1]
>>   >>>  print shape(tile(mean(m,1),[shape(m)[1],1]).T)
>> (4, 2)
>>
>> Note the difference between outputs of:
>> print shape(tile(mean(m,1),[shape(m)[1],1]).T)
>>
>> I mean, WTF?
>> This is definitely not the expected behavior.
>> Anybody knows what just happened here?
>
> [Never used scipy so pls excuse if I am off...]
>
> Given list m, in the class you are doing m ->  matrix(m)
> which you dont seem to be doing in the interpreter.

yes, that's the thing.

thanks a lot

FYI this happens because

 >>> shape(mean(m,1))
(4, 1)
 >>> shape(mean(array(m),1))
(4,)

thanks again