Re: Contouring in GnuPlot

[<pl...@pi...>]

On Wed, 18 Jul 2007 12:06:29 +0200, MartinOShea <ap...@ds...>  
wrote:

>
> Hello
>
> I have a set of sample data as follows:
>
> CEMI (x) ggbs(y) FLOW MM (z)
>
> 0.0        90.0     0
> 6.5        58.7     166
> 6.6        59.0     169
> 7.3        65.0     141
> 6.1        54.5     162		
> 8.5        76.2     217
> 7.1        64.2     174
> 6.0        54.2     209
> 7.0        63.0     198
> 7.6        68.3     171
>
> which produces a simple set of points on a 3D graph using splot. However,
> what I would like is to do is to interpolate between points to calculate  
> the
> coordinates for a flow contour of, for example, 175 mm?
>
> Can anyone advise how I might do this?
>
> Thanks
>
> Martin O'Shea.

This will almost certainly need to be done outside gnuplot by  
preprocessing the data. Catmull-Romm spline would probably be a good  
choice to interpolate your example contour at 175mm