Section 16
Matrices
m×n matrix
intermedioviz
Rectangular array of scalars.
Matrix addition
intermedioviz
Entrywise sum for matrices of the same size.
Scalar multiplication
intermedioviz
Scales every entry of the matrix.
Matrix product
intermedioviz
Each entry arises from a row–column dot product.
The number of columns of must match the number of rows of . In general, .
Identity matrix
intermedioviz
Identity element for matrix multiplication.
Transpose
intermedioviz
Swaps rows and columns.
Symmetric matrix
intermedioviz
Square matrix equal to its transpose.