[SOLVED] Plotting CDF and PDF in R with custom function

Plotting CDF and PDF in R with custom function

I was wondering if there was any way to plot this PDF and CDF in R. I found these on a different question a user asked, and was curious.

pdfcdf

I know that I have to create a function and then plot this, but I'm struggling with the different parameters and am unsure how to translate this to R. I have only ever plotted PDF/CDF using a normal distribution, or from datasets.

Solution

You can write the pdf and cdf as functions, using ifelse to specify the values within the ranges, then simply plot the functions over the desired range:

pdf <- function(x) {
  ifelse(x >= 0 & x < 1, 0.5, ifelse(x < 1.5 & x >= 1, 1, 0))
}

cdf <- function(x) {
  ifelse(x < 0, 0,
         ifelse(x >= 0 & x < 1, 0.5 * x,
                ifelse(x < 1.5 & x >= 1, x - 0.5, 1)))
}

plot(pdf, xlim = c(-1, 2), type = "s")


plot(cdf, xlim = c(-1, 2))

^{Created on 2022-10-27 with reprex v2.0.2}