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splot with variably translucent points

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  splot with variably translucent points fearless_fool <rdpoor@gmail.com> - 2011-09-22 14:47 -0700
    Re: splot with variably translucent points sfeam <sfeam@users.sourceforge.net> - 2011-09-22 19:05 -0700
    Re: splot with variably translucent points v.p.lipp@gmail.com - 2013-09-10 09:26 -0700

#596 — splot with variably translucent points

I want to visualize a minimization problem over three input variables
and one result.  With only two input variables, the visualization
problem would be trivial.

My thought is to use splot to plot 3D points, with the most opaque
point(s) representing the minima, and more translucent points as it
deviates from the minima.  This way, you should be able to see a
cluster of dark points near the minimum.

How do I set the transparency of each point from the input data?

Without variable transparency, I've got something as follows.  I'd
like to use $4 to control the transparency.
===========
set terminal pngcairo truecolor
set view 60, 136, 1.22, 1.26
splot "-" using 1:2:3 with points pointtype 7 pointsize 2 linecolor
rgb '#444444'
3 -4 -4 37.767
3 -4 -6 37.744
...
end

===========

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#597

fearless_fool wrote:

> I want to visualize a minimization problem over three input variables
> and one result.  With only two input variables, the visualization
> problem would be trivial.

Isn't this just a 3D heat map?
E.g. 3rd plot in 
    http://gnuplot.sourceforge.net/demo_cvs/heatmaps.html
 
> My thought is to use splot to plot 3D points, with the most opaque
> point(s) representing the minima, and more translucent points as it
> deviates from the minima.  This way, you should be able to see a
> cluster of dark points near the minimum.
> 
> How do I set the transparency of each point from the input data?

Sorry, the only plot style that currently supports variable alpha
is "with rgbalpha".
 
> Without variable transparency, I've got something as follows.  I'd
> like to use $4 to control the transparency.
> ===========
> set terminal pngcairo truecolor
> set view 60, 136, 1.22, 1.26
> splot "-" using 1:2:3 with points pointtype 7 pointsize 2 linecolor
> rgb '#444444'
> 3 -4 -4 37.767
> 3 -4 -6 37.744
> ...
> end
> 
> ===========

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#2026

On Thursday, September 22, 2011 11:47:31 PM UTC+2, fearless_fool wrote:
> I want to visualize a minimization problem over three input variables
> 
> and one result.  With only two input variables, the visualization
> 
> problem would be trivial.
> 
> 
> 
> My thought is to use splot to plot 3D points, with the most opaque
> 
> point(s) representing the minima, and more translucent points as it
> 
> deviates from the minima.  This way, you should be able to see a
> 
> cluster of dark points near the minimum.
> 
> 
> 
> How do I set the transparency of each point from the input data?
> 
> 
> 
> Without variable transparency, I've got something as follows.  I'd
> 
> like to use $4 to control the transparency.
> 
> ===========
> 
> set terminal pngcairo truecolor
> 
> set view 60, 136, 1.22, 1.26
> 
> splot "-" using 1:2:3 with points pointtype 7 pointsize 2 linecolor
> 
> rgb '#444444'
> 
> 3 -4 -4 37.767
> 
> 3 -4 -6 37.744
> 
> ...
> 
> end
> 
> 
> 
> ===========

Thank you guys for the hint. I would like to go further and try to plot a 5D-graph with circles using variable color, radii, and transparency. Is this possible?
Without transparency it looks like

plot 'something.dat' using 1:2:3:4 with points pt 7 ps variable lc palette

I expect something like

plot 'something.dat' using 1:2:3:4:5 with points pt 7 ps variable lc palette transparency variable

Could not find anything using search.

Thanks in advance!

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