[Numpy-discussion] numpy input with genfromttxt()
jonasr
jonas.ruebsam at web.de
Fri Jun 3 11:33:29 EDT 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 at 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 "." ?
>>>>
>>>> --
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>>>>
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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
>
>
>
> _______________________________________________
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> NumPy-Discussion at 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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