R/HW1Functions.R

In kuanghuangying/KuangHuangyingTools: Huangying Kuang's First Package

#' Calculate Mean, Variane, SD
#'
#' Computes the mean, variance and sd of a vector
#'
#' @param x vector
#'
#' @return list
#' @export
#' @examples
#' func1(rnorm(10))
func1 <- function(x){
  a = sum(x)/length(x)
  b = sum((x-a)^2)/length(x)
  c = sqrt(b)
  return(list(mean=a,var=b,sd=c))
}

#' Calculate Mean, Variane, SD (again)
#'
#' Computes the mean, variance and sd of a vector, but with user checks
#'
#' @param x vector
#'
#' @return list
#' @export
#' @examples
#' func2(rnorm(10))
func2 <- function(x){
  stopifnot(is.numeric(x))
  stopifnot(length(x)!=0)
  stopifnot(is.finite(x))
  stopifnot(!is.na(x))
  stopifnot(!is.nan(x))

  a = sum(x)/length(x)
  b = sum((x-a)^2)/length(x)
  c = sqrt(b)
  return(list(mean=a,var=b,sd=c))
}

#' MLE of gamma distribution
#'
#' Computes the liklihood of a gamma distribution
#'
#' @param x vector
#'
#' @return scalar
#' @export
#' @examples
#' func3(rnorm(10))
func3 <- function(x){
  alpha <- pi
  log <- function(alpha)
    sum(dgamma(x, shape = alpha, log = TRUE))
  interval <- mean(x) + c(-1,1) * 3 * sd(x)
  interval <- pmax(mean(x) / 1e3, interval)

  oout<- optimize(log, maximum = TRUE, interval)
  return (oout$maximum)
}

#' Weighted mean, var, sd
#'
#' Computes the weighted mean, var, sd
#'
#' @param d data.frame
#'
#' @return list
#' @export
#' @examples
#' data(d)
#' func4(d)
func4 <- function(d){

  a = sum(d$x * d$p)
  b = sum(((d$x - a)^2) * d$p)
  c = sqrt(b)
  return(list(mean=a,var=b,sd=c))

}

#' Weighted mean, var, sd with user checkes
#'
#' Computes the weighted mean, var, sd with user checks
#'
#' @param d data.frame
#'
#' @return list
#' @export
#' @examples
#' d <- read.table(url("http://www.stat.umn.edu/geyer/3701/data/q1p4.txt"),header = TRUE)
#' func5(d)
func5 <- function(d){

  stopifnot(is.numeric(d$x))
  stopifnot(is.numeric(d$p))

  stopifnot(length(d$x)!=0)
  stopifnot(length(d$p)!=0)

  stopifnot(is.finite(d$x))
  stopifnot(is.finite(d$p))

  stopifnot(!is.na(d$x))
  stopifnot(!is.na(d$p))

  stopifnot(!is.nan(d$x))
  stopifnot(!is.nan(d$p))

  stopifnot(all.equal(sum(d$p),1))

  a = sum(d$x * d$p)
  b = sum(((d$x - a)^2) * d$p)
  c = sqrt(b)
  return(list(mean=a,var=b,sd=c))

}

#' Highlevel check function
#'
#' Checks and throws error if not numeric, finit, zero lenth, NA, NAN
#'
#' @param x object
#'
#' @return object
#' @export
#' @examples
#' func6(NA)

func6 <- function(x){

  tryCatch(stopifnot(is.numeric(x)), error=function(e){print("not numeric")})
  tryCatch(stopifnot(is.finite(x)), error=function(e){print("not finite")})
  tryCatch(stopifnot(length(x)!=0), error=function(e){print("has 0 length")})
  tryCatch(stopifnot(!is.nan(x)), error=function(e){print("NA or NAN")})
  tryCatch(stopifnot(!is.na(x)), error=function(e){print("NA or NAN")})

}