Re: [Gnuplot-info] Vector fields with pseudo-file '+'

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

you need 'x' and 'y' values generated automatically, so you need 'splot':

# adjust vector length
l = 0.005
set xrange [-3:3]
set yrange [-3:3]
# number of x-values
set samples 20
# number of y-values
set isosamples 20
# view from top
set view 0,0
# and don't care about the 'empty z range' warning
splot '+' using 1:2:(0.0):(l*($2**2 - 2.*$1*$2)):(l*(3.*$1*$2 - 
6.*$1**2)):(0.0) with vectors

works, but 'plot' would be better, so first 'splot' into a table and then
use the resulting datafile as input:

set table 'data'
splot '+' ... (like above)
unset table
plot 'data' using 1:2:4:5 with vectors


Peter Danenberg wrote:
> 
> Has anyone plotted vector fields with the pseudo-file '+'? It would be
> nice to avoid intermediate files.
> 
> It seems like '+'s one-variable limitation in plot would make that
> impossible, though.
> 
> Intuitively, I want to do something like:
> 
>     plot '+' using ($1):($2):($2**2 - 2*$1*$2):(3*$1*$2 -  6*$1**2) \
>     with vectors
> 
> to express the vector equation:
> 
>     F(x, y) = <y^2 - 2xy, 3xy - 6x^2>
> 
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