2-d graph

### 5.2.1 2-d graph

plotfunc(f(x),x) draws the graph of y=f(x) for x in the default interval, plotfunc(f(x),x=a..b) draws the graph of y=f(x) for a≤ x≤ b. plotfunc accepts an optional `xstep=...` argument to specify the discretization step in x.
Input :

plotfunc(x`^`2-2)

or :

plotfunc(a`^`2-2,a=-1..2)

Output :

the graph of y=x`^`2-2

Input :

plotfunc(x`^`2-2,x,xstep=1)

Output :

a polygonal line which is a bad representation of y=x`^`2-2

It is also possible to specify the number of points used for the representation of the function with `nstep=` instead of `xstep=`. For example, input :

plotfunc(x`^`2-2,x=-2..3,nstep=30)