Re: [Gnuplot-info] streamline with gnuplot ?

[Mike B. <mba...@uk...>]

St=E9phane,

I'm not sure that I fully understand what you want to do, but assuming that=
=20
you are trying to plot a series of vectors (which represent stream lines?),=
=20
then try someting like the following:

plot 'stream.dat' u 1:2:3:3 w vector

where the file 'stream.dat' contains=20

four columns of data corresponding to the x, y, delta_x and delta_y=20
coordinates of the arrows. I've used this to produce hydrological routing=20
networks (small example attached). It's also possible to drape flow lines,=
=20
such these, over a 3D surface.

Good luck,

Mike

> To obtain streamline with gnuplot, I use the command lines :
>
> set xrange [-1:1]
> set yrange [-1:1]
> set arrow from 0,0 to 0.5,0.5
> plot (0)
> unset arrow
> set xrange [*:*]
> set yrange [*:*]
>
> The problem is that I do not know how to do without the command line
> "plot(0)".
>
> Indeed, without this command, I cannot see the arrow on my x11 terminal.
>
> What is the right way to obtain the arrows on my x11 terminal (i.e.
> without "plot(0)") ?