R - Matrix and Data Frame

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Let's now create a data in R with Matrix form:

Another method to create a data in R is Data Frame :

#Suppose we have 3 vectors of same dimension

patient_id = c(1,2,NA)
patient_name = c("x", "y", "z")
age = c(20,30,40)

Another methods to create similar data in R are cbind and rbind functions:

We need to understand one thing very clearly :

In the environment section, all the assignments are categorized into two parts

1. Values

2. Data   

All the vectors which are always uni-dimensional , are classified as values. 

Matrix and Data frame outputs, which can be uni as well as two dimensional are classified as data.

A Matrix can have only one type of data, either all numeric or all character, data frame can have a mix of both.

We are concluding this article covering basics of R with one more type of object called "List" 

A list is collection of object where each element can be of different data type. We define list with List function. List elements( components) can be of any type - vector, matrix, etc.

Suppose we have 3 objects

# A character vector
a = c("Ask", "Analytics")

# A matrix
b = matrix(1:4, nrow = 2)

# A logical vector
c= c(TRUE,FALSE)

we can create a list of the above 3 vectors:
List_1 = list(a,b,c)

Now to call any element of the List, we can use [[ ]] with position index and to check the list of objects in a list we can use command names

#To call the 3rd element, we write

List_1[[3]]

#To check the objects in List_1

names(List_1)

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