Homework 1

Homework 1 - basics of R.

Learned from R

As a new student on R, I’ve learned some interesting new ideas!

Basic Math

Below you will find how to do basic math addition, subtraction, multiplication, and division.

5+4

[1] 9

3-2

[1] 1

4/1

[1] 4

3*4

[1] 12

5+4+3*14-2/2

[1] 50

Logical Data

You can also use logic for data! This uses the ==, for equals, > greater than, < less than, and >= equal or greater or <= less than or equal to signs!

4==5

[1] FALSE

2==2

[1] TRUE

3>5

[1] FALSE

10>5

[1] TRUE

15>=15

[1] TRUE

1<=2

[1] TRUE

Assigning Data

You can also assign values to variables.

#create a variable x 

x <- 3

x+5

[1] 8

x*x

[1] 9

Reading Data into R

You can also read and plot data into R!

library(datasets)
plot(iris)

Summarazing Data

You can also use head() to see the first few lines of a table.

library(datasets)
head(iris)

  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1          5.1         3.5          1.4         0.2  setosa
2          4.9         3.0          1.4         0.2  setosa
3          4.7         3.2          1.3         0.2  setosa
4          4.6         3.1          1.5         0.2  setosa
5          5.0         3.6          1.4         0.2  setosa
6          5.4         3.9          1.7         0.4  setosa

Vectoring Data

To vector data you must use c() and <-. Here is a quick set up of if you wanted to find the median of yards ran if it was multiplied by 100.

yards <- c(12,50,100,22)

run_yards <- yards*100

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