 
 
 
19.7.1  2D parametric curve
- 
To draw a parametric curve in ℝ2,
plotparam takes two mandatory and one optional
argument:
- 
exprs, a list of two real expressions or one
complex expression involving the parameter.
- var, the parameter, optionally with a range
var=a..b. If no range is given, the values of
t- and t+ from the graphics configuration will
be used (see Section 2.5.8).
- Optionally, tstep=n, to set the discretization
step.
 
- plotparam(exprs,var ⟨,tstep=n ⟩)
draws the parametric representation of the curve.
Examples
| plotparam(cos(x)+i*sin(x),x) | 
or:
| plotparam([cos(x),sin(x)],x) | 
| plotparam(sin(t)+i*cos(t),t=-4..1) | 
or:
| plotparam(sin(x)+i*cos(x),x=-4..1) | 
or, with t-=4,t+=1 in the graphic configuration:
| plotparam(sin(t)+i*cos(t)) | 
| plotparam(sin(t)+i*cos(t),t=-4..1,tstep=0.5) | 
or, with t-=4,t+=1 in the graphic configuration:
| plotparam(sin(t)+i*cos(t),t,tstep=0.5) | 
 
 
