R Matrices

🧮 R Matrices

All elements in a matrix must be of the same data type.

 1. Creating a Matrix

Use the matrix() function.

📌 By default, R fills matrices column-wise.

 2. Fill Matrix by Row

 3. Matrix Indexing

 4. Matrix Dimensions

 5. Named Rows and Columns

 6. Matrix Arithmetic (Element-wise)

 7. Matrix Multiplication

Use %*% operator.

📌 %*% ≠ *

 8. Transpose of Matrix

 9. Combine Rows and Columns

Add rows

Add columns

10. Check if Object is Matrix

 11. Convert Vector to Matrix

 Matrices vs Data Frames

📌 Summary

• Matrices are 2D structures

• All elements must be same type

• Support mathematical operations

• Column-wise filling by default