### 6.11.1 2D parametric curve

plotparam([f(t),g(t)],t) or plotparam(f(t)+i*g(t),t) (resp. plotparam(f(t)+i*g(t),t=t1..t2)) draws the parametric representation of the curve defined by x=f(t),y=g(t) with the default range of values of t (resp. for t1 ≤ t≤ t2).
The default range of values is taken as specified in the graphic configuration (t- and t+, cf. 3.5.8). plotparam accepts an optional argument to specify the discretization step for t with tstep=.
Input :

plotparam(cos(x)+i*sin(x),x)

or :

plotparam([cos(x),sin(x)],x)

Output :

The unit circle

If in the graphic configuration t goes from -4 to 1, input :

plotparam(sin(t)+i*cos(t))

or :

plotparam(sin(t)+i*cos(t),t=-4..1)

or :

plotparam(sin(x)+i*cos(x),x=-4..1)

Output :

the arc (sin(-4)+i*cos(-4),sin(1)+i*cos(1)) of the unit circle

If in the graphic configuration t goes from -4 to 1, input :

plotparam(sin(t)+i*cos(t),t,tstep=0.5)

or :

plotparam(sin(t)+i*cos(t),t=-4..1,tstep=0.5)

Output :

A polygon approaching the arc (sin(-4)+i*cos(-4),sin(1)+i*cos(1)) of the unit circle