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3d plot with residuals at bottom in color

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  3d plot with residuals at bottom in color stefan.meingast@gmail.com - 2012-08-24 03:42 -0700
    Re: 3d plot with residuals at bottom in color stefan.meingast@gmail.com - 2012-08-24 03:45 -0700
    Re: 3d plot with residuals at bottom in color sfeam <sfeam@users.sourceforge.net> - 2012-08-25 20:42 -0700
      Re: 3d plot with residuals at bottom in color stefan.meingast@gmail.com - 2012-08-28 00:32 -0700

#1357 — 3d plot with residuals at bottom in color

Hi

I have a 3d data set which I can easily display with splot. What I want, however, is the following:

The 3 axes simply contain the 3d data and I also want to show a 3d-fit (i.e. a plane) which I also know already. Thats simple enough, but I would like to show the residuals of the fit to the data as a color map on the bottom of the graph.

Is that somehow possible?

thanks

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#1358

Am Freitag, 24. August 2012 12:42:56 UTC+2 schrieb stefan....@gmail.com:
> Hi
> 
> 
> 
> I have a 3d data set which I can easily display with splot. What I want, however, is the following:
> 
> 
> 
> The 3 axes simply contain the 3d data and I also want to show a 3d-fit (i.e. a plane) which I also know already. Thats simple enough, but I would like to show the residuals of the fit to the data as a color map on the bottom of the graph.
> 
> 
> 
> Is that somehow possible?
> 
> 
> 
> thanks

Ah, by the way: My data file is just a simple 3-column file without any spaces and it irregular...

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#1361

stefan.meingast@gmail.com wrote:

> Hi
> 
> I have a 3d data set which I can easily display with splot. What I
> want, however, is the following:
> 
> The 3 axes simply contain the 3d data and I also want to show a 3d-fit
> (i.e. a plane) which I also know already. Thats simple enough, but I
> would like to show the residuals of the fit to the data as a color map
> on the bottom of the graph.
> 
> Is that somehow possible?

Let P(x,y) be the equation for the plane fit.
Suppose your data is in columns 1, 2, and 3.
The the following command will plot
1) The data
2) The plane fit to the data
3) A pm3d (heat map) representation of the residual
   projected onto the xy plane 

splot 'data' using 1:2:3 with points, \
      P(x,y) using lines, \
      1:2:(0):($3 - P($1,$2)) using pm3d

(warning: this command not tested on actual data)

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#1362

Am Sonntag, 26. August 2012 05:42:32 UTC+2 schrieb sfeam:
> 
> 
> 
> > Hi
> 
> > 
> 
> > I have a 3d data set which I can easily display with splot. What I
> 
> > want, however, is the following:
> 
> > 
> 
> > The 3 axes simply contain the 3d data and I also want to show a 3d-fit
> 
> > (i.e. a plane) which I also know already. Thats simple enough, but I
> 
> > would like to show the residuals of the fit to the data as a color map
> 
> > on the bottom of the graph.
> 
> > 
> 
> > Is that somehow possible?
> 
> 
> 
> Let P(x,y) be the equation for the plane fit.
> 
> Suppose your data is in columns 1, 2, and 3.
> 
> The the following command will plot
> 
> 1) The data
> 
> 2) The plane fit to the data
> 
> 3) A pm3d (heat map) representation of the residual
> 
>    projected onto the xy plane 
> 
> 
> 
> splot 'data' using 1:2:3 with points, \
> 
>       P(x,y) using lines, \
> 
>       1:2:(0):($3 - P($1,$2)) using pm3d
> 
> 
> 
> (warning: this command not tested on actual data)

Hi

This was also my first approach, but it does not work since I do have irregular spaced data and no "space" between consecutive blocks in the file. In general, pm3d does not work well with irregular spaced data and after some time I gave up this idea because I do not think it is possible with gnuplot.

thanks anyway
cheers

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