Syntax error How to multiply corresponding values from two matrices in R?

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: 2021-11-09T06:19:48+05:30

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