R - datatypes, variables¶

Basics¶

Concatenation, length of vectors, numeric operations, matrix creation

Concatenation¶

In [2]:

x = c(1,2,3,4,5,6) #concatenate to create a vector
x

x = c(1,2,3,4,5,6) #concatenate to create a vector x

1. 1
2. 2
3. 3
4. 4
5. 5
6. 6

In [4]:

length(x)

length(x)

6

Numeric operations¶

vector 1 + vector 2 is a element by element summation

In [5]:

y = c(8,9,10,11,12,14)
x_y = x+y
x_y

y = c(8,9,10,11,12,14) x_y = x+y x_y

1. 9
2. 11
3. 13
4. 15
5. 17
6. 20

List all variables in memory¶

use ls()

In [6]:

ls()

ls()

1. 'x'
2. 'x_y'
3. 'y'

remove variables using rm(var_name)

In [8]:

rm('x_y')
ls()

rm('x_y') ls()

1. 'x'
2. 'y'

Getting help¶

use ?symbol to get help

In [7]:

?ls

?ls

Build a matrix¶

use matrix(data, nrow, ncol) method to build a nd matrix

In [9]:

m1 = matrix(data= x, nrow=2, ncol=3)
m1

m1 = matrix(data= x, nrow=2, ncol=3) m1

1	3	5
2	4	6

In [ ]: