Maybe try genfromtxt instead of loadtxt, it has a skip_footer option. -=- Olivier 2011/10/25 Massimo Di Stefano <massimodisasha@gmail.com>

i'm tring to generate an array reading a txt file from internet.

my target is to use python instead of matlab, to replace this steps in matlab :

url=['http://www.cdc.noaa.gov/Correlation/amon.us.long.data']; urlwrite(url,'file.txt');

i'm using this code :

urllib.urlretrieve('http://www.cdc.noaa.gov/Correlation/amon.us.long.data', 'file.txt') a = np.loadtxt('file.txt', skiprows=1)

but it fails becouse of the txt description at the end of the file,

do you know if exist a way to skip the X lines at the end,

something like "skipmultiplerows='1,-4'" (to skip the first and the last 4 rows in the file)

or i have to use some sort of string manipulation (readlines?) instead ?

Thanks!

--Massimo

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On Tue, Oct 25, 2011 at 12:28 PM, Massimo Di Stefano <massimodisasha@gmail.com> wrote:

urllib.urlretrieve('http://www.cdc.noaa.gov/Correlation/amon.us.long.data', 'file.txt') a = np.loadtxt('file.txt', skiprows=1)

but it fails becouse of the txt description at the end of the file,

It's always hard to stop reading before the end of a file, since we don't know when that's going to happen; I guess it would require a buffered approach. Fortunately, there is an easy workaround in your case. All the text lines start with " ", so simply do: np.loadtxt("amon.us.long.data", comments=" ") You should see a speedup of about 3 times over genfromtxt (loadtxt does much less under the hood). Stéfan