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R2012a Documentation → MATLAB
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Contents

Index

• Getting Started

• User's Guide

• Functions

• Desktop Tools and Development Environment

• Data Import and Export

• Mathematics

• Arrays and Matrices

• Linear Algebra

• Matrix Analysis

• Eigenvalues and Singular Values

• Matrix Logarithms and Exponentials

• Factorization

• Elementary Math

• Polynomials

• Interpolation and Computational Geometry

• Cartesian Coordinate System Conversion

• Nonlinear Numerical Methods

• Special Functions

• Sparse Matrices

• Math Constants

• Data Analysis

• Programming and Data Types

• Object-Oriented Programming

• Graphics

• 3-D Visualization

• GUI Development

• External Interfaces

• Examples

• Release Notes

trace - Sum of diagonal elements

Syntax

b = trace(A)

Description

b = trace(A) is the sum of the diagonal elements of the matrix A.

Algorithms

t = sum(diag(A));

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