Practice, Summary and QUIZ
Practice
Scientific Calculator 
Practice
Scientific Calculator
Problem: Compute double, triple or higher order integrals
install.packages("cubature")
library(cubature)
f <- function(x) 1
adaptIntegrate(f,lowerLimit = c(0,0,0),upperLimit = c(4,4,4))
$integral
[1] XX
Practice
Create a Function
Problem: Take a sample belonged to population and sum
pop <- 1:6 # This is my population
samp <- sample(pop, size = 2) # This is my sample, I choose two var.
sum(samp)
pop
samp
I want to create a new function named roll()
roll <- function() {
pop <- 1:6
samp <- sample(die, size = 2)
sum(samp)
}
roll()
Practice
Create a Function
Problem: What if we removed one line of code from our function and changed the name pop to box ?
roll2 <- function() {
samp <- sample(box, size = 2)
sum(samp)
}
roll2()
Re-create function
roll2 <- function(box) {
samp <- sample(box, size = 2)
sum(samp)
}
roll2(box = 1:4)
roll2(box = 1:6)
roll2(1:20)
Practice
Create a Function
- You can add new options
- { } and () are important
Practice
- Print your name as a character string.
- Print your age as a numeric type.
- Print your age as a character type.
print()
- Create a numeric vector with your favorite numbers.
- Check the lenght of the vector, lenght().
- Choose the last element (indexing) with [].
- Create 4 × 2 matrice, fill with numbers
- Delete first row.
- Generate 48 random number and assign, runif().
- Create and store a three-dimensional array with six layers of a 4 × 2 matrice, and fill it with these random numbers.
Summary
- Arithmetic Operators ( +, -, /, x )
- Logical Operators ( <, >, ==, != ….)
- Special Values ( NULL, Nan, NA, Inf)
- Vector, Matrice, Array (1d and Homogeneous)
- class(), print(), seq(), runif()
- c(), []
- ?xxx or help(xxx)
- install.packages(), library()
Extended Syllabus PDF
List - Data Frame - Attributes - ATMOS