Re: [Matplotlib-users] Plotting multiline graph with large dataset (6 lines, about 30, 000, 000 points total

[Oz N. <na...@gm...>]

Hello Krishna,

This is really crazy ploting so many data point, after all the human
eye can't separate all the data.
Try sampling the vector of the data point - to a smaller extent.

Here's a quick and dirty solution how to sample every nth element in a
vector - there's probably a faster way, with out loops, but this works
for now

$ python
Python 2.5.5 (r255:77872, Feb  1 2010, 19:53:42)
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from nupmy import arange
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named nupmy
>>> from numpy import arange
>>> a=arange(1,15)
>>> a
array([ 1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14])
>>> from numpy import zeros
>>> a_sampled=zeros(5)
>>> a_sampled
array([ 0.,  0.,  0.,  0.,  0.])
>>> range(0,15,5)
[0, 5, 10]
>>> range(0,15,3)
[0, 3, 6, 9, 12]
>>> fileter_indecies=range(0,15,3)
>>> for i in range(len(a_sampled)):
...   a_sampled[i]=a[fileter_indecies[i]]
...
>>> a_sampled
array([  1.,   4.,   7.,  10.,  13.])


I hope it helps

-- 
Oz Nahum
Graduate Student
Zentrum für Angewandte Geologie
Universität Tübingen

---

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