Getting some strange artifacts when I save a figure as a PDF in
matplotlib. Here are some screen shots. PDF <http://imgur.com/oQDXkWn>
and PNG <http://imgur.com/bCw3Fn4>. Any idea why that is happening?
Here is (most of) the source code that makes the plot. I stripped out
the data generation, because it is long and involved, and doesn't really
matter. Basically what the script is supposed to do is make a scatter
plot where the density is below some threshold, and a 2d histogram when
it is above that threshold. The code seems to work fine, but when I save
the figure (using savefig in Ipython) it shows up funny.
Thanks.
import pylab as pyl
bins = [50,50]
thresh = 3
xdat = #generate or load some data
ydat = #generate or load some data
hh, locx, locy = pyl.histogram2d(xdat, ydat,
range=[[-1,4],[-26,-10]], bins=bins)
posx = pyl.digitize(xdat, locx)
posy = pyl.digitize(ydat, locy)
# finds the bins which contain points. posx = 0 for points outside
"range"
ind = (posx > 0) & (posx <= bins[0]) & (posy > 0) & (posy <= bins[1])
# values of histogram with points in the bins.
hhsub = hh[posx[ind] - 1, posy[ind] - 1]
xdat1 = xdat[ind][hhsub < thresh] # low density points
ydat1 = ydat[ind][hhsub < thresh]
hh[hh < thresh] = pyl.nan # fill the areas with low density by NaNs
pyl.scatter(xdat1, ydat1, s=20, c='0.8')
pyl.imshow(pyl.log10(hh.T), cmap='gray_r',
extent=pyl.array([[-1,4],[-26,-10]]).flatten(),
interpolation='none')
pyl.show()
--
Steven Boada
Doctoral Student
Dept of Physics and Astronomy
Texas A&M University
bo...@physics.tamu.edu
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