## Draw Function Plots

## Usage

    curve(expr, from, to, n=101, ...)

## Arguments

`expr` | an expression, written as a function of `x` which will be plotted.
`from,to` | the range over which the function will be plotted.
`n` | the expression will be evaluated at `n` points equally spaced over the range `[from, to]`. The points determined in this way are then joined with straight lines.
`...` | graphical parameters can also be specified as arguments.

## Description

This function draws a curve corresponding to the given expression (in `x`) over the interval `[from,to]`. It is a quick hack which seems to serve a useful purpose, but can give bad results for functions which are discontinuous.

## Value

`NULL`. For ``expensive'' `expr`essions, you should smarter tools.

## See Also

`splinefun` for spline interpolation, `lines`.

## Examples

    curve(x^3-3*x, -2, 2)
    curve(x^2-2, add = TRUE, col = "violet")

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