How to Perform Element-Wise Comparisons in R - Step by Step Examples

How to Perform Element-Wise Comparisons in R ?

Answer

In R, you can perform element-wise comparisons on matrices using logical operators such as ==, !=, <, <=, >, and >=. These comparisons return a matrix of the same dimensions with logical values indicating the result of the comparison for each element.

✐ Examples

1 Comparing Elements of a Matrix with a Scalar

In this example,

We start by creating a matrix named mat.
We compare each element of the matrix mat with a scalar value 3 using the greater than operator >.
This comparison returns a matrix of logical values where each element indicates whether the corresponding element in mat is greater than 3.
We assign the result to a variable named comparison_result.
We print the comparison_result to the console to see the matrix of logical values.

R Program

mat <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
comparison_result <- mat > 3
print(comparison_result)

Output

     [,1]  [,2]  [,3]
[1,] FALSE FALSE FALSE
[2,]  TRUE  TRUE  TRUE

2 Comparing Two Matrices Element-Wise

In this example,

We start by creating two matrices named mat1 and mat2.
We compare each element of mat1 with the corresponding element in mat2 using the equality operator ==.
This comparison returns a matrix of logical values where each element indicates whether the corresponding elements in mat1 and mat2 are equal.
We assign the result to a variable named comparison_result.
We print the comparison_result to the console to see the matrix of logical values.

R Program

mat1 <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
mat2 <- matrix(c(1, 1, 3, 4, 4, 6), nrow = 2)
comparison_result <- mat1 == mat2
print(comparison_result)

Output

     [,1]  [,2]  [,3]
[1,]  TRUE FALSE  TRUE
[2,]  TRUE FALSE  TRUE

3 Finding Elements Less Than or Equal to a Value

In this example,

We start by creating a matrix named mat.
We compare each element of the matrix mat with a scalar value 4 using the less than or equal to operator <=.
This comparison returns a matrix of logical values where each element indicates whether the corresponding element in mat is less than or equal to 4.
We assign the result to a variable named comparison_result.
We print the comparison_result to the console to see the matrix of logical values.

R Program

mat <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
comparison_result <- mat <= 4
print(comparison_result)

Output

     [,1] [,2] [,3]
[1,]  TRUE  TRUE  TRUE
[2,]  TRUE FALSE FALSE

Summary

In this tutorial, we learned How to Perform Element-Wise Comparisons in R language with well detailed examples.

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