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Lecture 8 - HMC Math
Lecture 8 - HMC Math

... Since A~x = ~0 has only the trivial solution ~x = ~0, by the Fundamental Thm of Inverses, we have that A is invertible, i.e., A−1 exists. Thus, (BA)A−1 = IA−1 =⇒ B (AA−1) = A−1 =⇒ B = A−1. | {z } I ...
Chapter 18. Introduction to Four Dimensions Linear algebra in four
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... Cramer’s formula involves sixteen 3 × 3 determinants and one 4 × 4 determinant. Usually one asks a computer to work this out. However if the matrix has a lot of zeros or has some pattern, then the determinants det Aij , hence A−1 , may computed by hand without too much trouble. Eigenvalues and Eigen ...
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Properties of Matrices
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... To find the ith row, jth column element of AB, multiply each element in the ith row of A by the corresponding element in the jth column of B. (Note the shaded areas in the matrices below.) The sum of these products will give the row i, column j element of AB. ...
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... The right side requires n multiplies and about n adds for each j and k. That makes n × n2 = n3 multiplies and adds in total. The formulas (3) have (almost) exactly 2n3 flops in this sense. More generally, suppose A is n × m and B is m × p. Then AB is n × p, and it takes (approximately) m flops to ca ...
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3.IV. Matrix Operations - National Cheng Kung University
3.IV. Matrix Operations - National Cheng Kung University

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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.
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