Membuat Fungsi Matematis di Rstudio

library(mosaic)

## Registered S3 method overwritten by 'mosaic':
##   method                           from   
##   fortify.SpatialPolygonsDataFrame ggplot2

## 
## The 'mosaic' package masks several functions from core packages in order to add 
## additional features.  The original behavior of these functions should not be affected by this.

## 
## Attaching package: 'mosaic'

## The following objects are masked from 'package:dplyr':
## 
##     count, do, tally

## The following object is masked from 'package:Matrix':
## 
##     mean

## The following object is masked from 'package:ggplot2':
## 
##     stat

## The following objects are masked from 'package:stats':
## 
##     binom.test, cor, cor.test, cov, fivenum, IQR, median, prop.test,
##     quantile, sd, t.test, var

## The following objects are masked from 'package:base':
## 
##     max, mean, min, prod, range, sample, sum

as_daily_income <- function(yearly_income, duration) {
  yearly_income/duration
}

as_daily_income(20000000, 365)

## [1] 54794.52

drug_remaining <- function(dose, duration, time_constant) {
  dose * exp(-duration / time_constant)
}

t = 0;20

## [1] 20

plotFun(drug_remaining(dose = 100, time_constant = 4, duration = t) ~ t, t.lim = range(0, 20))