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How to find the percentage of zeros in each column of a matrix in R?
To find the percentage of zeros in each column of a matrix in R, we can follow the below steps −
First of all, create a matrix.
Then, use colSums function along with nrow function to find the percentage of zeros in each column.
Example 1
Create the matrix
Let’s create a matrix as shown below −
M1<-matrix(rpois(100,2),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 1 1 0 [2,] 1 1 3 3 [3,] 2 1 4 0 [4,] 1 2 1 0 [5,] 2 0 2 1 [6,] 2 2 1 2 [7,] 4 4 3 5 [8,] 0 2 5 2 [9,] 1 0 5 1 [10,] 0 0 1 5 [11,] 1 3 2 2 [12,] 0 2 0 4 [13,] 2 4 2 2 [14,] 2 3 1 3 [15,] 1 1 2 3 [16,] 1 3 1 2 [17,] 4 2 2 2 [18,] 1 0 2 3 [19,] 6 0 4 3 [20,] 1 0 1 0 [21,] 2 4 0 0 [22,] 2 2 3 2 [23,] 3 1 2 1 [24,] 2 0 1 1 [25,] 3 4 0 0
Find the percentage of zeros
Using colSums function along with nrow function to find the percentage of zeros in each column of matrix M1 −
M1<-matrix(rpois(100,2),ncol=4) (colSums(M1==0)/nrow(M1))*100
Output
[1] 12 28 12 24
Example 2
Create the matrix
Let’s create a matrix as shown below −
M2<-matrix(sample(0:10,100,replace=TRUE),ncol=4) M2
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,] 5 0 2 8 [2,] 7 10 7 9 [3,] 4 3 2 2 [4,] 7 6 2 1 [5,] 3 2 10 4 [6,] 2 2 7 1 [7,] 10 3 6 1 [8,] 9 3 7 8 [9,] 7 6 5 4 [10,] 10 9 0 3 [11,] 5 0 7 6 [12,] 1 7 1 8 [13,] 0 9 6 5 [14,] 4 0 6 7 [15,] 7 10 0 1 [16,] 5 9 7 1 [17,] 8 3 7 10 [18,] 4 9 6 8 [19,] 6 10 10 1 [20,] 8 0 10 5 [21,] 7 4 0 10 [22,] 4 3 5 10 [23,] 2 7 0 10 [24,] 3 2 6 10 [25,] 4 0 9 3
Find the percentage of zeros
Using colSums function along with nrow function to find the percentage of zeros in each column of matrix M2 −
M2<-matrix(sample(0:10,100,replace=TRUE),ncol=4) (colSums(M2==0)/nrow(M2))*100
Output
[1] 4 20 16 0
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