How to create a matrix in R?
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How to create a matrix in R?

How to create a matrix in R?

This recipe helps you create a matrix in R

Recipe Objective

How to create a matrix in R ? A matrix is a two-dimensional data structure, i.e., a matrix contains rows and columns. Matrices are used for performing mathematical calculations. A matrix function takes the following input values: matrix (data, nrow, ncol, byrow, dimnames). Data — is our input matrix value, nrow and ncol — are the number of rows and columns required, if byrow=TRUE , the input numbers are arranged by rows and if byrow=FALSE, then they are arranged by columns. dimnames — assigns names to rows and columns of a data frame. This recipe demonstrates how we can create a matrix of any dimension in R.

Step 1 - Create a matrix

Creating a matrix using the matrix() function. with byrow=TRUE condition.

m <- matrix(c(1:10), nrow = 4, ncol = 5, byrow = TRUE) print(m) #The output is a 4*5 matrix where the numbers are arranged by rows.
 "Output of the code " : 

     [,1] [,2] [,3] [,4] [,5]
[1,]    1    2    3    4    5
[2,]    6    7    8    9   10
[3,]    1    2    3    4    5
[4,]    6    7    8    9   10 

Step 2 - Create a matrix

Creating a matrix using the matrix() function. with byrow=FASLE condition.

m <- matrix(c(1:10), nrow = 4, ncol = 5, byrow = FALSE) print(m) #The output is a 4*5 matrix where the numbers are arranged by columns.
 "Output of the code " : 
   [,1] [,2] [,3] [,4] [,5]
[1,]    1    5    9    3    7
[2,]    2    6   10    4    8
[3,]    3    7    1    5    9
[4,]    4    8    2    6   10

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