One Simple Equation

# devtools::install_github("timelyportfolio/functionplotR")

library(functionplotR)

functionplot("x + 2")

Multiple Simple Functions

There a couple ways to supply functions to functionplot. Below is the easiest but least flexible.

# devtools::install_github("timelyportfolio/functionplotR")

library(functionplotR)

functionplot(c("x + 2","x"))

With Some Options

function-plot gives us lots of options. Let’s use some of them to configure our plot from above.

# devtools::install_github("timelyportfolio/functionplotR")

library(functionplotR)

functionplot(
  # use the more flexible but a little more confusing
  #  way to provide functions
  fn = list(
    list( fn = "x + 2", color = "black" ),
    list( fn = "x", color = "gray" )
  ),
  yDomain = c(-4, 4),
  xDomain = c(-4, 4),
  width = 420, 
  height = 400
)

Function with Derivative

One of my favorite features of function-plot is the ability to plot interactive derivatives. It does require you to know the derivative though. With a quick Google, I think I now remember the derivative of cos(x). It is fun to put in something other than the derivative. Try x as an example.

# devtools::install_github("timelyportfolio/functionplotR")

library(functionplotR)

functionplot(
  fn = list(
    list(
      fn = "cos(x)",
      derivative = list(
        fn = "-sin(x)",
        updateOnMouseMove = TRUE
      )
    )
  )
)