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# Get a matrix as Output if a condition for a single value is met in R.

If we want to check a condition and the Output based on that condition needs to be a matrix then we can use if else function in R.

For Example, if we have a value say V = 5 and we want to get matrix M1 if V is equal to 5 and matrix M2 if V is not equal to 5 then we can use the below command −

if (V == 5) M1 else M2

## Example

Following snippet creates a sample matrices −

M1<-matrix(rpois(80,10),ncol=4) M1

The following matrix is created −

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

To get a matrix as Output if a condition for a single value is met in R, on the above created matrix, add the following code to the above snippet −

M1<-matrix(rpois(80,10),ncol=4) M2<-matrix(rpois(80,1),ncol=4) M2

The following matrix is created −

[,1] [,2] [,3] [,4] [1,] 2 0 2 4 [2,] 0 1 1 2 [3,] 0 0 0 0 [4,] 0 3 1 1 [5,] 0 1 1 0 [6,] 0 1 2 1 [7,] 0 1 0 0 [8,] 2 0 2 1 [9,] 0 1 0 0 [10,] 0 2 1 1 [11,] 1 0 1 2 [12,] 0 1 0 1 [13,] 0 2 0 0 [14,] 1 0 2 0 [15,] 0 0 0 1 [16,] 1 1 1 0 [17,] 0 1 2 1 [18,] 1 0 1 1 [19,] 0 2 1 0 [20,] 2 2 1 2

To get matrix as Output Conditional_Value is equal to or not equal to 5 on the above created data frame, add the following code to the above snippet −

M1<-matrix(rpois(80,10),ncol=4) M2<-matrix(rpois(80,1),ncol=4) Conditional_Value<-2 if (Conditional_Value == 5) M1 else M2

The following matrix is created −

[,1] [,2] [,3] [,4] [1,] 2 0 2 4 [2,] 0 1 1 2 [3,] 0 0 0 0 [4,] 0 3 1 1 [5,] 0 1 1 0 [6,] 0 1 2 1 [7,] 0 1 0 0 [8,] 2 0 2 1 [9,] 0 1 0 0 [10,] 0 2 1 1 [11,] 1 0 1 2 [12,] 0 1 0 1 [13,] 0 2 0 0 [14,] 1 0 2 0 [15,] 0 0 0 1 [16,] 1 1 1 0 [17,] 0 1 2 1 [18,] 1 0 1 1 [19,] 0 2 1 0 [20,] 2 2 1 2

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