How to plot a function curve in R

Here is a lattice version:

library(lattice)
eq<-function(x) {x*x}
X<-1:1000
xyplot(eq(X)~X,type="l")

Lattice output

plot has a plot.function method

plot(eq, 1, 1000)

curve(eq, 1, 1000)

You mean like this?

> eq = function(x){x*x}
> plot(eq(1:1000), type='l')

Plot of eq over range 1:1000

(Or whatever range of values is relevant to your function)

I did some searching on the web, and this are some ways that I found:

The easiest way is using curve without predefined function

curve(x^2, from=1, to=50, , xlab="x", ylab="y")

enter image description here

You can also use curve when you have a predfined function

eq = function(x){x*x}
curve(eq, from=1, to=50, xlab="x", ylab="y")

enter image description here

If you want to use ggplot,

library("ggplot2")
eq = function(x){x*x}
ggplot(data.frame(x=c(1, 50)), aes(x=x)) + 
  stat_function(fun=eq)

enter image description here

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