Re: [Matplotlib-users] Artefacts in contour plot?

[Nadia D. <den...@st...>]

I've been able to reproduce the problem on MacOSX (after the 
correction), although I don't have
an answer to what's causing it now.

Nadia Dencheva

On Jan 18, 2005, at 2:38 PM, Dominique Orban wrote:

> (Sorry, sending this again to correct a typo -- i inverted small and 
> large below)
>
> I have made several experiments; I have installed the latest matplotlib
> (with the 'contour' update) in both Win XP and SuSE Linux Pro 9.1. I
> made sure to uninstall everything pertaining to matplotlib before
> installing the latest version. In Windows, I use the pre-built
> distribution, and in Linux I compile it myself. The situation is this:
>
> - In Linux, some zigzagging lines appear when there are few points to
> interpolate. Eg, if i generate my grid from
> 	x = y = arange( -1, 1, delta ),
> zigzags would appear for LARGE values of delta (eg, delta = 0.2; ie 
> too few values of x and/or y). However, it seems that those zigzags 
> are a normal consequence of a large value of delta. For SMALLER 
> deltas, the contours are beautiful.
>
> - In XP, the same as above happens. But I see additional lines that
> don't seem to represent anything meaningful. I made sure I was
> performing a clean install. Are there updates to other packages I 
> should
> consider? Pygtk? This happened with both the TkAgg and GTKAgg backends.
> Perhaps I should try compiling matplotlib myself?
>
> If anyone is able to reproduce the problem, then it might indeed be a
> problem. If not, perhaps something is funny with my box.
>
> Thanks,
> Dominique
>
>
>
>
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