19.2.1  2D graph

The plotfunc or funcplot command draws the graph of a function.

plotfunc can draw the graph of a one-variable function or a two-variable function; this section will discuss one-variable functions and the next section will discuss two-variable functions.

• plotfunc takes one mandatory argument and two optional arguments:
  • expr, an expression defining a function.
  • Optionally, var, the variable name (by default x) possibly with bounds. If the variable is given as var=a..b, the graph will be drawn from a to b, otherwise it will be graphed over the default interval (see Section 2.5.8).
  • Optionally, opt, which can be xstep=n to specify the discretization step or nstep=n to specify the number of points used to graph.
• plotfunc(expr,var ⟨,opt ⟩) draws the graph.

Examples