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Re: contour with latest CVS and gnuplot 4.0
From: |
David Bateman |
Subject: |
Re: contour with latest CVS and gnuplot 4.0 |
Date: |
Fri, 23 Mar 2007 15:07:39 +0100 |
User-agent: |
Thunderbird 1.5.0.7 (X11/20060921) |
John W. Eaton wrote:
> On 23-Mar-2007, David Bateman wrote:
>
> | I get no output with
> |
> | [x,y] = meshgrid(-10:10); z =1./sqrt(x.^2 + y.^2); contour(z)
> |
> | or with
> |
> | [x,y] = meshgrid(-10:10); z =1./sqrt(x.^2 + y.^2); contour(x,y,z)
> |
> | with a recent CVS and gnuplot 4.0. Is this expected? If it is expected
> | is there a way around it?
>
> The contour function was changed recently to use the contour functions
> from octplot to generate the contour lines which are then plotted
> using 2-d plotting commands (the line function). The first thing that
> happens in a call like
>
> contour (z)
>
> is
>
> [c, lev] = contourc (z);
>
> For your Z, I see
>
> c = [](2x0)
> lev =
>
> Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf
>
> and there is nothing to plot. I haven't looked to see why this might
> be happening.
>
> jwe
>
>
Ok it seems that contourc doesn't handle "Inf"'s.. This
[x,y] = meshgrid(-10:10); z =1./sqrt(x.^2 + y.^2); z(11,11) = 2;
contour(x,y,z)
works..
D.
--
David Bateman address@hidden
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