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## matplotlib-users

 Re: [Matplotlib-users] Plotting multiline graph with large dataset (6 lines, about 30, 000, 000 points total From: Oz Nahum - 2010-02-10 18:17:52 ```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 "", line 1, in 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 --- Imagine there's no countries it isn't hard to do Nothing to kill or die for And no religion too Imagine all the people Living life in peace ```
 Re: [Matplotlib-users] Plotting multiline graph with large dataset (6 lines, about 30, 000, 000 points total From: Christopher Barker - 2010-02-10 18:28:13 ```Oz Nahum wrote: > 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, there sure is: In [8]: orig Out[8]: array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]) In [9]: orig[0:-1:4] # every 4th element Out[9]: array([ 0, 4, 8, 12, 16]) -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@... ```
 Re: [Matplotlib-users] Plotting multiline graph with large dataset (6 lines, about 30, 000, 000 points total From: Alan G Isaac - 2010-02-10 18:39:01 ```On 2/10/2010 1:17 PM, Oz Nahum wrote: > This is really crazy ploting so many data point, after all the human > eye can't separate all the data. Following up on Oz's point ... let's suppose that is 5M points for each of the 6 lines, and that you will try to place them on a 5 inch wide axis. That is 1M plotted points per horizontal inch. Here is a list of typical monitor pixel densities: http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density Alan Isaac ```