Re: [Gnuplot-info] Vector Fields

[Thomas S. <t.s...@fz...>]

set xrange [-5:5]
set yrange [-5:5]
# only integer x-cordinates
set samples 11
# only integer y-cordinates
set isosamples 11
# we need data, so we use the special filename "++", which
# produces x,y-pairs
plot "++" using 1:2:1:(2.*$2) with vectors


Soothfast wrote:
> 
> The document gnuplot.pdf, as a means of learning gnuplot "from the ground
> up," seems to be a lost cause.  It's the first time, in ten years of
> learning new programs, software and systems (and Java and FORTRAN), that
> I've run up against a genuinely unreadable manual.  It's main use for me
> is to remind me of certain things I figured out before but need to freshen
> up on after a week of disuse.  
> 
> So I'll have to learn things by example.  I'm aware of the site
> http://gnuplot.sourceforge.net/demo/.  It's quite good for figuring out
> how to come up with pretty pictures of scalar-valued functions and
> surfaces, but now I want to be able to make simple vector fields.  All
> roads seem to lead to the same example:
> http://gnuplot.sourceforge.net/demo/vector.html.  But it's far too
> complicated and has too many other extraneous things (whoop-de-doo contour
> lines and other bells and whistles) for me to zero in on the code for
> making a simple 2D vector field.  
> 
> Let F(x,y) = <x,2y> be the vector field that assigns to each point (x,y)
> the vector <x,2y>, using the typical calculus text notation.  What code,
> minimally, will produce this vector field in the window [-5:5]x[-5:5] at
> points with, say, integer coordinates?
> 
> Also, IS there any decent book or website out there that helps explain
> these things better?
> 

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