Syntax error How to divide the matrix rows by row minimum in R?

How to divide the matrix rows by row minimum in R?

To divide matrix row values by row minimum in R, we can follow the below steps −

  • First of all, create a matrix.
  • Then, use apply function to divide the matrix row values by row minimum.

Create the matrix

Let’s create a matrix as shown below −

 Live Demo

> M<-matrix(sample(1:20,75,replace=TRUE),ncol=3)
> M

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

     [,1] [,2] [,3]
[1,]  16    1   18
[2,]  18   12    1
[3,]  12   19   19
[4,]   7    2   18
[5,]  10   14   16
[6,]   8    4    8
[7,]  15   14    4
[8,]   2    1   17
[9,]  11   12    8
[10,] 11   19    6
[11,]  8    2    7
[12,]  8   14    1
[13,]  5   19   18
[14,] 17   14    6
[15,] 13   12   18
[16,]  1   19   14
[17,]  9   19   17
[18,] 10   11    6
[19,]  3    2    2
[20,] 18   15    9
[21,] 11   18   11
[22,]  4   19    7
[23,]  3    9   19
[24,] 12    7   19
[25,]  5    5    2

Divide the matrix row values by row minimum

Using apply function to divide the row values of M by row minimum −

 Live Demo

> M<-matrix(sample(1:20,75,replace=TRUE),ncol=3)
> M_new<-t(apply(M,1, function(x) x/min(x)))
> M_new

Output

          [,1]      [,2]     [,3]
[1,]  16.000000  1.000000  18.000000
[2,]  18.000000  12.000000 1.000000
[3,]  1.000000   1.583333  1.583333
[4,]  3.500000   1.000000  9.000000
[5,]  1.000000   1.400000  1.600000
[6,]  2.000000   1.000000  2.000000
[7,]  3.750000   3.500000  1.000000
[8,]  2.000000   1.000000  17.000000
[9,]  1.375000   1.500000  1.000000
[10,] 1.833333   3.166667  1.000000
[11,] 4.000000   1.000000 3.500000
[12,] 8.000000   14.000000 1.000000
[13,] 1.000000   3.800000 3.600000
[14,] 2.833333   2.333333 1.000000
[15,] 1.083333   1.000000 1.500000
[16,] 1.000000   19.000000 14.000000
[17,] 1.000000   2.111111 1.888889
[18,] 1.666667   1.833333 1.000000
[19,] 1.500000   1.000000 1.000000
[20,] 2.000000   1.666667 1.000000
[21,] 1.000000   1.636364 1.000000
[22,] 1.000000   4.750000 1.750000
[23,] 1.000000   3.000000 6.333333
[24,] 1.714286   1.000000 2.714286
[25,] 2.500000   2.500000 1.000000
Updated on: 2021-08-13T09:22:37+05:30

119 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements