ggplot2 - How to plot a function curve in R

Question

What are the alternatives for drawing a simple curve for a function like

eq = function(x){x*x}

in R?

It sounds such an obvious question, but I could only find these related questions on stackoverflow, but they are all more specific

• Plot line function in R
• Plotting functions on top of datapoints in R
• How can I plot a function in R with complex numbers?
• How to plot a simple piecewise linear function?
• Draw more than one function curves in the same plot

I hope I didn't write a duplicate question.

Answer 1

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")

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")

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)