gnuplot-info

[Gnuplot-info] Plotting level sets (contour lines)

[Felix W. <Fel...@os...>]

Hi,

I'd like to plot level sets of

Q = min(x**2, 2*y)

for Q = 2 and Q = 4.

What's the best way to do this?  I cannot really turn the equation into 
a function of either x or y.  My ideas are: Using splot's contour 
feature (but I'd rather like to use "plot"), and turning the equation 
into a parametric function, which seems pretty ugly and non-universal.

Any advice?

Thanks in advance,

     Felix

-- 
Felix Wiemann -- http://www.ososo.de/

Re: [Gnuplot-info] Plotting level sets (contour lines)

[<br...@ph...>]

Felix Wiemann wrote:

 > My ideas are: Using splot's contour
> feature (but I'd rather like to use "plot"), and turning the equation 
> into a parametric function, which seems pretty ugly and non-universal.

Use contour, and if you really need it in a 2D plot, see 'help table' 
for how to save the result of 'set contour' isocurve extraction to a 
file you can use in a 2D plot.