** + Plus. **

** X + Y adds matrices X and Y. X and Y must have the same **

** dimensions unless one is a scalar (a 1-by-1 matrix). **

** A scalar can be added to anything. **

** **

** **

** - Minus. **

** X - Y subtracts matrix X from Y. X and Y must have the same **

** dimensions unless one is a scalar. A scalar can be subtracted **

** from anything. **

** **

** **

** * Matrix multiplication. **

** X*Y is the matrix product of X and Y. Any scalar (a 1-by-1 matrix) **

** may multiply anything. Otherwise, the number of columns of X must **

** equal the number of rows of Y. **

** **

** **

** .* Array multiplication **

** X.*Y denotes element-by-element multiplication. X and Y **

** must have the same dimensions unless one is a scalar. **

** A scalar can be multiplied into anything. **

** **

** **

** ^ Matrix power. **

** Z = X^y is X to the y power if y is a scalar and X is square. If y is an **

** integer greater than one, the power is computed by repeated **

** multiplication. For other values of y the calculation **

** involves eigenvalues and eigenvectors. **

** Z = x^Y is x to the Y power, if Y is a square matrix and x is a scalar, **

** computed using eigenvalues and eigenvectors. **

** Z = X^Y, where both X and Y are matrices, is an error. **

** **

** **

** .^ Array power. **

** Z = X.^Y denotes element-by-element powers. X and Y **

** must have the same dimensions unless one is a scalar. **

** A scalar can operate into anything. **

** Copyright (c) 1984-93 by The MathWorks, Inc. **

** **