On Jan 27, 2012, at 9:11 AM, Fabien Lafont wrote:

> Ive tried:
> 
> for i in range(0,NbPts):
>    if column1[i] == nan:
>        column1[i].remove(nan)
>        column2[i].remove(nan)
> 
> to remove these points but it doesn't work
> 

you are close, I think what you want is: 

# assuming column1 and 2 are numpy arrays
import numpy as np

for i in range(0,NbPts):
   if np.isnan(column1[i]):
       column1=np.remove(column1,i,0)
       column1=np.remove(column2,i,0)

> 
> 2012/1/27 Benjamin Root <ben.r...@ou.edu>:
>> On Fri, Jan 27, 2012 at 9:52 AM, Fabien Lafont <lafont.fab...@gmail.com>
>> wrote:
>>> 
>>> Sorry, It's an awkward manipulation. I finish the mail
>>> 
>>> 2012/1/27 Fabien Lafont <lafont.fab...@gmail.com>:
>>>> I want to plot something like:
>>>> 
>>>> 
>>>> X(time)        Ypoints
>>>> 0                    8
>>>> 1
>>>> 2                    7
>>>> 3                    6
>>>> 4                    4
>>>> 5
>>>> 6
>>>> 7                    7
>>>> 8                    2
>>>> 9                   10
>>> 
>>> In fact I've recorded some live datas and when I use genfromtxt() the
>>> blank parts are "translated" as 'nan' and I can't for example fit it
>>> with polynomials.
>>> 
>> 
>> If you plot the data, it should skip data points that are NaNs and you
>> should see a break in the line IIRC.  Is that not what you want?
>> 
>> Ben Root
>> 
> 
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