splot and a 4th value...

Hello NG,

I have here a GPS track with x,y and z coordinates. I'm analyzing these data for a fried of mine who wants to be perfect in swooping. Small description:
He jumps out of a plane with parachute, open it and makes some figures. Whatever... Aim is to find out what figure he has to fly that the highest acceleration could be reached. Best would be a diagram for debreefing on eveing...

I'm getting these logs out of a GPS, having now all values in my hand and tried to show diagrams in gnuplot.

The (modified) logfile looks e.g. like:
637051 5274645 880 0.514856
637047 5274644 880 0.38099344
637042 5274649 880 4.0158768
....
First column is x, second y and the third z (the height). Last column is the calulated acceleration in m/s^2


(every log has about 600 or more lines)

so I have:
x, y, z and the acceleration

how can I display the 4th value (the acceleration) like a errorbar to the diagram? Or as a vector, or color... doesn't mind. I have no idea...


Robert

.

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