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| pmf <- function(a, b, pmf) { | |
| # To convert pmf to a function | |
| pmf <- gsub(" ", "", pmf) | |
| pmf <- substr(pmf, start=6, stop=nchar(pmf)) | |
| funcion <- function(x) eval(parse(text=pmf)) | |
| # To obtain probs and cumulative | |
| x_vals <- a:b | |
| n <- length(x_vals) | |
| probs <- numeric(n) | |
| for (i in 1:n) | |
| probs[i] <- funcion(x_vals[i]) | |
| suma <- sum(probs) | |
| cumul_probs <- cumsum(probs) | |
| list(x_vals=x_vals, | |
| cumul_probs=cumul_probs, | |
| probs=probs, | |
| suma=suma) | |
| } | |