Matrix
Matrix is kind of rectangular array arranged in rows and columns. A matrix with i rows and j columns
could be notated as
could be notated as
A Square matrix has equal number of rows and columns.
A Symmetric matrix is equal to its transpose.
A=A'
A diagonal matrix is a symmetric matrix, where all off-diagonal elements are all zeros.
An identity matrix denoted as I is a diagonal matrix, where all diagonal elements are 1.
There is AI=IA=A
There is AI=IA=A
A unit matrix denoted as J is all-ones matrix
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