Practice, Summary and QUIZ
Practice
Scientific Calculator ![]()
Practice
Scientific Calculator
Problem: Compute double, triple or higher order integrals
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install.packages("cubature")
library(cubature)
f <- function(x) 1
adaptIntegrate(f,lowerLimit = c(0,0,0),upperLimit = c(4,4,4))
$integral
[1] XX
BONUS
What is Function ?
A function is a set of statements organized together to perform a specific task
ex: mean() (arithmetic mean)
x <- c(1,2,3)
mean(x)
(1+2+3) / 3
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) {
pop <- 1:6
samp <- sample(pop, size = 2)
sum(samp)
}
roll()
Practice
Problem: I want to define population myself, in every time. remove pre-defined population and changed the name pop to box ?
roll2 <- function(box) {
samp <- sample(box, size = 2)
sum(samp)
}
roll2(box)
box ?
box = 1:6
roll2(box)
roll2(box = 1:6)
roll2(1:6)
Practice
Create a Function
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- 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. (minus indexing)
- Generate 48 random number and assign it, 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
