Re: [Gnuplot-info] gnuplot language

[rhubbell <rhu...@ih...>]

Ok, this makes more sense now. I'm sure it's obvious to some.
Was not obvious to me.

I'm still trying to understand parametric mode.

I would like to be able to create a plot like that using
experimental data.

Could one z-value be assigned zero all the time and the
other z-value be the z from the x,y,z triple from the file?

Maybe I'm going about this all wrong. The data is like
this:

col. 1 = date/time
col. 2-25 = data for hours 0-23

So the data are in rows. Does gnuplot not like data in rows?
I can massage into columns but that makes the data files
4 * (row oriented data file in bytes)


On Sun, 2008-11-30 at 11:39 -0800, Thomas Sefzick wrote:
> 'surface1.16.gnu' simply doesn't work with data, because
> it works in parametric mode using 2 parameters (u,v) which
> require the use of functions to map to (x,y,z), producing
> vertical surfaces which in non-parametric mode are not
> possible to plot.
> 
> data from a file are read as (x,y,z) triples, therefore 'splot'
> works in non-parametric mode, so there is only one z-value
> per (x,y) coordinate.
> this means, no way to produce vertical surfaces which need
> two z-values per (x,y) coordinate.
> 
> > For example taking this demo and making it into a demo that uses
> > experimental data would provide an excellent example
> > of using data files.
> >
> > http://gnuplot.sourceforge.net/demo_4.2/surface1.16.gnu
>