getting graph coordinates and others

[Jérôme LEFEVRE]

Hi,

 

I 'm new octave user and i try to adapt matlab tool with octave and gnuplot. Tools are mesh builder and tide analyser for oceanographic and finite element model purpose.

 

1/

 

My main problem is with interactive dialog between octave and gnuplot, specialy with getting graph coordinates from plot.
With ginput, i can get screen ccordinates, but not directly "real" graph coordinates.

 

In a other hand, new gnuplot package (3.8) integrate mouse support, which allow user to zoomin, grab a point from plot with pointer and so on.
In gnuplot help, man can read clipboard notion too.

 

I have played a little around octave and gnuplot, but i don't interstand how to act interactively between octave and gnuplot new feature. I think that there is a mean to get or copy graph coordinates toward octave, but i don't know how.

 

Anybody has an idea or a trick ??

 

2/

 

In FAQ, contributor and developper reffer others plot package, like plplot or pgplot.
Do these plot pakage really support getting "real" graph coordinates and act interactivily with octave ?

 

3/

 

Matlab Toolbox from DARTMOUTH Numerical and Mathematical Laboratory are using to generate and edit Finite Element Mesh.
Slowy, i adapt program and function with octave, but i fear to meet problem with calculation time consumption. I work with large matrice (200000 - 500000 rows) and i will request octave for work like editing, interpolation, renumbering, bandwith reduction, refinment and diagnostic and final mesh plotting.
Will Octave bring off this challenge ?

 

Many thanks for your hint.

 

Best regards.

 

Jerome Lefevre.