[Gnuplot-info] plotting a cloud of 3D points colored based on a 4th dimension

[Francois B. <ber...@ri...>]

Dear gnuplot hackers,

I have some file like this:

---
0 1 2 7
1 1 2 8
2 1 2 9
[...]
---

In fact in my file all numbers are floats
but I don't think its important to illustrate my point.

I'd like to plot the 3 first columns as points
in 3D and use the 4th column to make their color vary.

Is this possible?

I tried several things and even found some close
topic in the demos (cf. third example here 
http://gnuplot.sourceforge.net/demo_4.3/heatmaps.html)
but did not manage to get what I want.

Thanks a lot,
Francois.