Plotting functions on top of datapoints in R

Question

Is there a way of overlaying a mathematical function on top of data using ggplot?

## add ggplot2
library(ggplot2)

# function
eq = function(x){x*x}

# Data           


        

Answer 1

Given that your question title is "plotting functions in R", here's how to use curve to add a function to a base R plot.

Create data as before

eq = function(x){x*x}; x = (1:50); y = eq(x)

Then use plot from base graphics to plot the points followed by curve with the add=TRUE argument, to add the curve.

plot(x, y,  xlab = "X-axis", ylab = "Y-axis") 
curve(eq, add=TRUE)