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How to multiply corresponding values from two matrices in R?
To multiply corresponding values from two matrices in R, we can follow the below steps −
First of all, create two matrices.
Then, use mapply function to multiply corresponding values from those two matrices.
Example
Create the first matrix
Let’s create a matrix as shown below −
M1<-matrix(rpois(100,5),ncol=4) M1
Output
On executing, the above script generates the below output(this output will vary on your system due to randomization) −
[,1] [,2] [,3] [,4] [1,] 2 6 8 3 [2,] 10 4 7 5 [3,] 5 5 5 8 [4,] 8 8 3 3 [5,] 9 5 8 3 [6,] 7 5 3 9 [7,] 12 9 3 5 [8,] 6 4 6 5 [9,] 5 6 4 4 [10,] 7 5 3 9 [11,] 6 6 4 6 [12,] 2 7 3 6 [13,] 7 8 7 5 [14,] 5 6 8 6 [15,] 4 4 7 4 [16,] 4 8 8 1 [17,] 4 3 3 6 [18,] 5 4 7 3 [19,] 7 7 7 8 [20,] 5 4 4 3 [21,] 4 5 3 5 [22,] 5 4 9 5 [23,] 5 6 5 3 [24,] 4 2 6 5 [25,] 5 3 5 3
Create the second matrix
Let’s create a matrix as shown below −
M2<-matrix(rpois(100,2),ncol=4) M2
Output
[,1] [,2] [,3] [,4] [1,] 4 2 2 3 [2,] 2 2 3 8 [3,] 2 3 1 1 [4,] 0 3 1 2 [5,] 3 1 1 3 [6,] 4 2 0 3 [7,] 4 2 5 4 [8,] 1 0 4 1 [9,] 3 0 4 3 [10,] 2 3 0 0 [11,] 0 2 0 1 [12,] 0 0 2 4 [13,] 2 2 4 1 [14,] 2 0 4 0 [15,] 1 2 2 3 [16,] 0 5 3 5 [17,] 0 2 1 2 [18,] 4 1 2 2 [19,] 5 3 2 2 [20,] 2 0 3 2 [21,] 1 2 3 2 [22,] 4 1 3 6 [23,] 2 2 1 2 [24,] 4 3 2 4 [25,] 1 2 2 5
Multiply corresponding values from two matrices
Using mapply function to multiply corresponding values in matrices M1 and M2 −
M1<-matrix(rpois(100,5),ncol=4) M2<-matrix(rpois(100,2),ncol=4) mapply(`*`,M1,M2)
Output
[1] 8 20 10 0 27 28 48 6 15 14 0 0 14 10 4 0 0 20 35 10 4 20 10 16 5 [26] 12 8 15 24 5 10 18 0 0 15 12 0 16 0 8 40 6 4 21 0 10 4 12 6 6 [51] 16 21 5 3 8 0 15 24 16 0 0 6 28 32 14 24 3 14 14 12 9 27 5 12 10 [76] 9 40 8 6 9 27 20 5 12 0 6 24 5 0 12 5 12 6 16 6 10 30 6 20 15
Updated on: 09-Nov-2021
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