What is a matrix
A matrix is a set of complex or real numbers arranged in a rectangular array. A matrix with real numbers is called a real matrix, and a matrix with elements is a complex matrix. A matrix with the number of rows and columns equal to n is called an n-th order matrix or an n-th order square matrix.
A number table of m rows and n columns arranged by m × n numbers aij is called a matrix of m rows and n columns, which is referred to as an m × n matrix. Referred to as:
Relationship of scalar, vector, matrix, tensor
These 4 concepts are constantly rising in dimensionality. It is easier to understand the metaphorical explanation with the concept of point-line polyhedron:
Interested parties can learn more about the following: