Dear R folks,

currently the section Examples contains the following as an example on
how to plot a “normal” function.

        plot(sin, -pi, 2*pi)

Since it does not contain the argument for the function it would be
helpful to add for example the following.

        ## plots the graph of f(x) = x**2 with f(x) ∈ [1, 10]
        
        curve(x**2, 1, 10)
        
        ## plots the graph of f(x) = x**3 with f(x) ∈ [1, 10] and adds it to an 
already existing plot
        
        curve(x**3, 1, 10, add=T)
        
        ## plots the graph of f(x) = x**4 connected by lines and adds it to an 
already existing plot
        
        lines(x, x**4, add=T)

`curve` and `lines` could be also added to the section See Also.


Thanks,

Paul

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