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

[<fcc...@fi...>]

On Friday 14 January 2005 14:48, Dominique Orban wrote:

I don't get any zig-zag lines on my box when I run your code...

as for being sideways, I cant tell since I don't have matlab here...

I don't have a solution, but it doesn't seem to be a matplotlib problem.

I am running, version 0.70.1

good luck,

=46l=E1vio


> Hi,
>
> When trying to plot the contours of the famous Rosenbrock function:
>
> ----------------------------------------
> from matplotlib.pylab import *
>
> def rosenbrock(x,y):
>      return 10.0 * (y-x**2)**2 + (x-1)**2
>
> x =3D arange( -1.5, 1.5, 0.01 )
> y =3D arange( -0.5, 1.5, 0.01 )
> [X,Y] =3D meshgrid( x, y )
> Z =3D rosenbrock( X, Y )
> contour( Z, x=3DX, y=3DY, levels =3D 50 )
> show()
> ----------------------------------------
>
> I notice some spurious zigzagging lines towards the top of the plot. Any
> idea where those might be coming from?
>
> Also, the figure produced by the above script is flipped horizontally.
> The corresponding Matlab script produces the correct plot.
>
> Thanks,
> Dominique
>
>
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