[Numpy-discussion] numpy input with genfromttxt()

Olivier Delalleau shish@keba...
Fri Jun 3 12:36:23 CDT 2011


2011/6/3 Bruce Southey <bsouthey@gmail.com>

> On 06/03/2011 10:33 AM, jonasr wrote:
> >
> >
> > 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.
> >>>>>
> >>>>> _______________________________________________
> >>>>> NumPy-Discussion mailing list
> >>>>> NumPy-Discussion@scipy.org
> >>>>> http://mail.scipy.org/mailman/listinfo/numpy-discussion
> >>>>>
> >>>> _______________________________________________
> >>>> NumPy-Discussion mailing list
> >>>> NumPy-Discussion@scipy.org
> >>>> http://mail.scipy.org/mailman/listinfo/numpy-discussion
> >>>>
> >>>>
> >> 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 ?
> >
> >
> >
> >
> You don't seem to be using Python.
> The 'In [37]' suggest ipython so you have to find how ipython does this.
>
> However, I am not sure that changing locale will help here but I am
> rather naive on this. If it doesn't then file a ticket with a clear
> example and ideally with a patch (one can hope).
>
> Bruce
>

Should work just the same in iPython. Works fine with me in iPython with
Python 2.5.1.

-=- Olivier
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