How to do Element-Wise Operations in a Matrix in R - Step by Step Examples

How to do Element-Wise Operations in a Matrix in R ?

Answer

To perform element-wise operations on a matrix in R, you can use arithmetic operators like +, -, *, and / between matrices or between a matrix and a scalar.

✐ Examples

1 Element-Wise Addition of Two 2x2 Matrices

In this example,

We first create two 2x2 matrices named matrix1 and matrix2 using the matrix() function. For matrix1, we provide a vector of values c(1, 2, 3, 4) and specify the number of rows as 2. Similarly, for matrix2, we provide a vector of values c(5, 6, 7, 8) and specify the number of rows as 2.
Next, we perform the element-wise addition operation by using the addition operator + to add matrix1 and matrix2 element-wise. The result is stored in a new variable called resultMatrix1.
Finally, we use the print() function to display the resulting matrix resultMatrix1.

R Program

matrix1 <- matrix(c(1, 2, 3, 4), nrow = 2)
matrix2 <- matrix(c(5, 6, 7, 8), nrow = 2)
resultMatrix1 <- matrix1 + matrix2
print(resultMatrix1)

Output

[,1] [,2]
[1,]  6   9
[2,]  8  12

2 Element-Wise Multiplication of a 3x3 Matrix by a Scalar

In this example,

We first create a 3x3 matrix named matrix3 using the matrix() function. We provide a vector of values c(1, 2, 3, 4, 5, 6, 7, 8, 9) and specify the number of rows as 3.
Next, we define a scalar value scalar and set it to 2. This is the value by which each element of the matrix will be multiplied.
We then perform the element-wise multiplication operation by using the multiplication operator * to multiply matrix3 by scalar. The result is stored in a new variable called resultMatrix2.
Finally, we use the print() function to display the resulting matrix resultMatrix2.

R Program

matrix3 <- matrix(c(1, 2, 3, 4, 5, 6, 7, 8, 9), nrow = 3)
scalar <- 2
resultMatrix2 <- matrix3 * scalar
print(resultMatrix2)

Output

[,1] [,2] [,3]
[1,]  2   8  14
[2,]  4  10  16
[3,]  6  12  18

Summary

In this tutorial, we learned How to do Element-Wise Operations in a Matrix in R language with well detailed examples.

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How to do Element-Wise Operations in a Matrix in R - Step by Step Examples

How to do Element-Wise Operations in a Matrix in R ?

Answer

✐ Examples

1 Element-Wise Addition of Two 2x2 Matrices

R Program

Output

2 Element-Wise Multiplication of a 3x3 Matrix by a Scalar

R Program

Output

Summary

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