Entering Data

How to Manually Enter Raw Data in R?

Enter data as a matrix

To enter data as a matrix in the R Language, we create all the columns of the matrix as a vector and then use the column binding function that is cbind() to merge them together into a matrix. The cbind() function is a merge function that combines two data frames or vectors with the same number of rows into a single data frame.

Syntax: mat <- cbind( col1, col2 )

where, col1, col2: determines the column vectors that are to be merged to form a matrix.

Example:

Here, is a basic 3X3 matrix in the R Language made using the cbind() function.

R

# create 3 column vectors with 3
# rows each for a 3X3 matrix
col1 <- c(1,2,3)
col2 <- c(4,5,6)
col3 <- c(7,8,9)
  
# merge three column vectors into a matrix
mat <- cbind(col1, col2, col3)
  
# print matrix, its class and summary
print("Matrix:")
mat
print("Class:")
class(mat)
print("Summary:")
summary(mat)

Output:

Matrix:
    col1 col2 col3
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9
Class:
"matrix" "array" 
Summary:
     col1          col2          col3    
Min.   :1.0   Min.   :4.0   Min.   :7.0  
1st Qu.:1.5   1st Qu.:4.5   1st Qu.:7.5  
Median :2.0   Median :5.0   Median :8.0  
Mean   :2.0   Mean   :5.0   Mean   :8.0  
3rd Qu.:2.5   3rd Qu.:5.5   3rd Qu.:8.5  
Max.   :3.0   Max.   :6.0   Max.   :9.0