Re: [Gnuplot-info] Plot an ellipse knowing center and axis

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

> I am new to gnuplot and I need to draw an ellipse on a distribution of
data. 
> I know the center of the ellipse and the semimajor and semiminor axis.
> 
> Has someone some example code ?

center of ellipse: xm,ym
semimajor axis: a
semiminor axis: b

for example:

xm = 5
ym = 2
a = 2
b = 1

set xrange [-1:10]
set yrange [-1:5]
set zeroaxis
set parametric

fx(t)=xm+a*cos(t)
fy(t)=ym+b*sin(t)

set arrow 1 from xm,ym to (xm+a),ym
set arrow 2 from xm,ym to xm,(ym+b)

plot fx(t),fy(t)

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