[Numpy-discussion] numpy input with genfromttxt()

jonasr jonas.ruebsam@web...
Fri Jun 3 10:33:29 CDT 2011




Bruce Southey wrote:
> 
> On 06/03/2011 09:33 AM, jonasr wrote:
>> thank you very much, works much nicer and faster in comparison to the
>> script
>> i wrote and used before  ,
>> im not that much used to lambda forms but it seems quit usefull in
>> situations like this
>>
>>
>> Olivier Delalleau-2 wrote:
>>> Here's an ugly one-liner:
>>>
>>> numpy.genfromtxt('data.txt', converters=dict([k, lambda x:
>>> float(x.replace(',', '.'))] for k in
>>> range(len(open('data.txt').readline().strip().split()))))
>>>
>>> -=- Olivier
>>>
>>> 2011/6/3 jgrub<jonas.ruebsam@web.de>
>>>
>>>> Hello, im actually try to read in  data with genfromtxt(),
>>>> i want to read in numbers which are stored in  a textfile like this:
>>>>
>>>> 0,000000        0,001221        0,001221        0,000000       
>>>> 1,278076
>>>>       160,102539
>>>>
>>>> 4,000000E-7     0,000000        0,000000        0,002441       
>>>> 1,279297
>>>>       160,000000
>>>>
>>>> 8,000000E-7     -0,001221       0,000000        0,001221       
>>>> 1,279297
>>>>       159,897461
>>>>
>>>> 1,200000E-6     0,000000        0,000000        0,001221       
>>>> 1,279297
>>>>       160,000000
>>>>
>>>> 1,600000E-6     -0,001221       0,000000        0,003662       
>>>> 1,278076
>>>>       159,897461
>>>>
>>>> 2,000000E-6     0,000000        -0,001221       0,003662       
>>>> 1,279297
>>>>       160,000000
>>>>
>>>> my problem is that they are seperated with a comma so when i try to
>>>> read
>>>> them
>>>> i just get a numpy array with NaN's.  is there a short way to replace
>>>> the
>>>> "," with "."  ?
>>>>
>>>> --
>>>> View this message in context:
>>>> http://old.nabble.com/numpy-input-with-genfromttxt%28%29-tp31757790p31757790.html
>>>> Sent from the Numpy-discussion mailing list archive at Nabble.com.
>>>>
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> Isn't this just because of the 'locale' settings?
> A quick search showed  ticket 884 that has code changing the locale that 
> may be useful for you:
> http://projects.scipy.org/numpy/ticket/884
> 
> Perhaps a similar bug exists with genfromtxt?
> 
> If it is nicely behaved, just use Python's csv module.
>  From the csv documentation:
> "Since open() 
> <http://docs.python.org/release/3.1.3/library/functions.html#open> is 
> used to open a CSV file for reading, the file will by default be decoded 
> into unicode using the system default encoding (see 
> locale.getpreferredencoding() 
> <http://docs.python.org/release/3.1.3/library/locale.html#locale.getpreferredencoding>). 
> To decode a file using a different encoding, use the encoding argument 
> of open:"
> 
> 
> Bruce
> 
> 
> 
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion@scipy.org
> http://mail.scipy.org/mailman/listinfo/numpy-discussion
> 
> 

i checked my local settings and got

In [37]: locale.getlocale()
Out[37]: ('de_DE', 'UTF8')

when i try

locale.setlocale(locale.LC_NUMERIC, 'de_DE') 

i get: Error: unsupported locale setting
same with 'fi_FI'
any idea ?




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