Hi Andrew,
On Friday 20 June 2008 19:28:20 Andrew Straw wrote:
> When I attempt to plot small-scale features with the PS backend, it
> seems that there's a granularity at which things cannot be further
> specified. I cannot remember encoutering this before, although I can't
> be sure it's not an old phenomenon. Anyhow, the following script
> illustrates the issue. With the PS backend, zooming in on the output
> shows the points spread significantly away from their locations that
> would be expected.
>
> import matplotlib
> matplotlib.use('PS')
> import pylab
> import numpy
>
> x=numpy.linspace(-100,100,2000)
> x+=0.001*numpy.random.rand(len(x))
>
> y=numpy.sin(x/30.0)
> y+=0.001*numpy.random.rand(len(x))
>
> pylab.plot(x,y,'.',ms=0.1)
> pylab.savefig('dots_dynamic_range')
>
> With the Agg and PDF backends, this does not occur. I'm attaching a few
> example images which hopefully make the issue clear. (These have all
> seen a little bit of processing to reduce the file sizes.)
I see this also. I checked the text contents of the ps file, and the precision
after the decimal place is lost. This is surprising behavior to me:
In [4]: '%1.3g %1.3g'% (429.120463939, 155.230815676)
Out[4]: '429 155'
I changed it back to "%g %g", like it is in the v91 branch.
Darren
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