Re: [Matplotlib-users] Millions of data points saved to pdf

[Shahar S. K. <ka...@po...>]

How about different line styles or colors instead of markers?—
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On Thu, May 1, 2014 at 2:10 PM, nertskull <ner...@gm...> wrote:

> I am trying to create a multipage pdf of about 750 different graphs.
> Each graph has around 5,000 - 15,000 data points, giving me roughly 7
> million points across the pdf.  I make it in a large pdf with a page length
> of about 20 inches, and then plot about 10 graphs to a page.  So I end up
> with basically 75 pages in my pdf.  I'm basically trying to graph a line of
> XY data points.
> The problem, is the pdf is unbearably slow when plotting as a scatter plot
> or as a line with markers.
> If I make a regular line plot, with no markers, just a single line, it is
> plotted and the pdf is fine.  But then it connects my points which I don't
> want.  
> I assume this is all because its making the pdf in vector format.  And when
> I convert it to single lines, I only have ~750 line vectors.  But when I try
> to scatter plot, or line plot with markers, I end up with millions of
> vectors.
> I've tried the 'rasterized=True' and that definitely works.  But the quality
> is really bad.  I need to be able to zoom in close on the pdf and still see
> rough resolution of the points.  
> For clarity, I don't actually need to see each individual points.  The
> graphs have two lines on them, and I just need to be able to distinguish
> between the two lines.  The two lines are just made up of thousands of
> points each.
> Is there anyway to keep scalable vectors and do this?  Or will I just be
> forced to go to a rasterized image file in order to load the pdf in a
> reasonable time.
> Thanks.
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