How to Combine Matrices by Columns in R - Step by Step Examples

How to Combine Matrices by Columns in R ?

Answer

To combine matrices by columns in R, you can use the cbind() function. This function takes two or more matrices as arguments and combines them by columns, resulting in a new matrix where the columns of the input matrices are concatenated side by side.

How to Combine Matrices by Columns in r language

✐ Examples

1 Combining Two Matrices by Columns

In this example,

  1. We create a matrix named matrix1 with the values from 1 to 6 arranged in 2 rows and 3 columns using the matrix() function. The matrix() function takes a vector of values and the arguments nrow and ncol to specify the number of rows and columns respectively.
  2. We then create another matrix named matrix2 with the values from 7 to 12 arranged in 2 rows and 3 columns using the matrix() function.
  3. We use the cbind() function to combine matrix1 and matrix2 by columns. This function concatenates the columns of matrix1 and matrix2 side by side, resulting in a new matrix named combined_matrix.
  4. The cbind() function returns a new matrix with the combined columns of the input matrices.
  5. Finally, we print the value of combined_matrix to standard output to see the combined result.

R Program

matrix1 <- matrix(1:6, nrow = 2, ncol = 3)
matrix2 <- matrix(7:12, nrow = 2, ncol = 3)
combined_matrix <- cbind(matrix1, matrix2)
print(combined_matrix)

Output

     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1    3    5    7    9   11
[2,]    2    4    6    8   10   12

2 Combining Three Matrices by Columns

In this example,

  1. We create a matrix named matrix1 with the values from 1 to 4 arranged in 2 rows and 2 columns using the matrix() function. The matrix() function takes a vector of values and the arguments nrow and ncol to specify the number of rows and columns respectively.
  2. We then create another matrix named matrix2 with the values from 5 to 8 arranged in 2 rows and 2 columns using the matrix() function.
  3. Next, we create a third matrix named matrix3 with the values from 9 to 12 arranged in 2 rows and 2 columns using the matrix() function.
  4. We use the cbind() function to combine matrix1, matrix2, and matrix3 by columns. This function concatenates the columns of the three matrices side by side, resulting in a new matrix named combined_matrix.
  5. The cbind() function returns a new matrix with the combined columns of the input matrices.
  6. Finally, we print the value of combined_matrix to standard output to see the combined result.

R Program

matrix1 <- matrix(1:4, nrow = 2, ncol = 2)
matrix2 <- matrix(5:8, nrow = 2, ncol = 2)
matrix3 <- matrix(9:12, nrow = 2, ncol = 2)
combined_matrix <- cbind(matrix1, matrix2, matrix3)
print(combined_matrix)

Output

     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1    3    5    7    9   11
[2,]    2    4    6    8   10   12

3 Combining Matrices of Different Sizes by Columns

In this example,

  1. We create a matrix named matrix1 with the values from 1 to 9 arranged in 3 rows and 3 columns using the matrix() function. The matrix() function takes a vector of values and the arguments nrow and ncol to specify the number of rows and columns respectively.
  2. We then create another matrix named matrix2 with the values from 10 to 15 arranged in 3 rows and 2 columns using the matrix() function.
  3. We use the cbind() function to combine matrix1 and matrix2 by columns. This function concatenates the columns of matrix1 and matrix2 side by side, resulting in a new matrix named combined_matrix.
  4. The cbind() function returns a new matrix with the combined columns of the input matrices.
  5. Finally, we print the value of combined_matrix to standard output to see the combined result.

R Program

matrix1 <- matrix(1:9, nrow = 3, ncol = 3)
matrix2 <- matrix(10:15, nrow = 3, ncol = 2)
combined_matrix <- cbind(matrix1, matrix2)
print(combined_matrix)

Output

     [,1] [,2] [,3] [,4] [,5]
[1,]    1    4    7   10   13
[2,]    2    5    8   11   14
[3,]    3    6    9   12   15

Summary

In this tutorial, we learned How to Combine Matrices by Columns in R language with well detailed examples.


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