Trace of Positive Integer Power of Real 2 × 2 Matrices

... The computation of the trace of matrix powers has received much attention. In [5], an algorithm for computing Tr Ak , k ∈ Z is proposed, when A is a lower Hessenberg matrix with a unit codiagonal. In [6], a symbolic calculation of the trace of powers of tridiagonal matrices is presented. Let A be a ...

... The computation of the trace of matrix powers has received much attention. In [5], an algorithm for computing Tr Ak , k ∈ Z is proposed, when A is a lower Hessenberg matrix with a unit codiagonal. In [6], a symbolic calculation of the trace of powers of tridiagonal matrices is presented. Let A be a ...

Matrices and Linear Algebra with SCILAB

... write the summation symbol, Σ, with its associated indices, if he used the convention that, whenever two indices were repeated in an expression, the summation over all possible values of the repeating index was implicitly expressed. Thus, the equation for the generic term of a matrix multiplication, ...

... write the summation symbol, Σ, with its associated indices, if he used the convention that, whenever two indices were repeated in an expression, the summation over all possible values of the repeating index was implicitly expressed. Thus, the equation for the generic term of a matrix multiplication, ...

8 Square matrices continued: Determinants

... Things get worse quickly as the dimension increases. For an n × n matrix A, the expression for det(A) has n factorial = n! = 1 · 2 · . . . (n − 1) · n terms, each of which is a product of n matrix entries. Even on a computer, calculating the determinant of a 10 × 10 matrix using this sort of formula ...

... Things get worse quickly as the dimension increases. For an n × n matrix A, the expression for det(A) has n factorial = n! = 1 · 2 · . . . (n − 1) · n terms, each of which is a product of n matrix entries. Even on a computer, calculating the determinant of a 10 × 10 matrix using this sort of formula ...

Matrices

... In other words, the square matrix A = [aij]n×n is an identity matrix, if aij = 1, when i = j and aij = 0, when i ≠ j. (vii) A matrix is said to be zero matrix or null matrix if all its elements are zeroes. We denote zero matrix by O. (ix) Two matrices A = [aij] and B = [bij] are said to be equal if ...

... In other words, the square matrix A = [aij]n×n is an identity matrix, if aij = 1, when i = j and aij = 0, when i ≠ j. (vii) A matrix is said to be zero matrix or null matrix if all its elements are zeroes. We denote zero matrix by O. (ix) Two matrices A = [aij] and B = [bij] are said to be equal if ...

Chapter 1

... – A matrix A with n rows and n columns is called a square matrix of order n, and entries a11, a22,...,ann are said to be on the main diagonal of A. • Operations on Matrices – Definition: Two matrices are defined to be equal if they have the same size and their corresponding entries are equal. – Defi ...

... – A matrix A with n rows and n columns is called a square matrix of order n, and entries a11, a22,...,ann are said to be on the main diagonal of A. • Operations on Matrices – Definition: Two matrices are defined to be equal if they have the same size and their corresponding entries are equal. – Defi ...

# Matrix completion

In mathematics, matrix completion is the process of adding entries to a matrix which has some unknown or missing values.In general, given no assumptions about the nature of the entries, matrix completion is theoretically impossible, because the missing entries could be anything. However, given a few assumptions about the nature of the matrix, various algorithms allow it to be reconstructed. Some of the most common assumptions made are that the matrix is low-rank, the observed entries are observed uniformly at random and the singular vectors are separated from the canonical vectors. A well known method for reconstructing low-rank matrices based on convex optimization of the nuclear norm was introduced by Emmanuel Candès and Benjamin Recht.