www.gusucode.com > elfun工具箱matlab源码程序 > elfun/isreal.m
%ISREAL True for real array. % ISREAL(X) returns 1 if X does not have an imaginary part % and 0 otherwise. % % ~ISREAL(X) detects arrays that have an imaginary part even if % it is all zero. % ~ANY(IMAG(X(:))) detects strictly real arrays, whether X has % an all zero imaginary part allocated or not. % % Example: % x = magic(3); % y = complex(x); % In this example, isreal(x) returns true. isreal(y) returns % false, because COMPLEX returns y with an all zero imaginary % part. % % See also REAL, IMAG, COMPLEX, I, J. % Copyright 1984-2005 The MathWorks, Inc. % Built-in function.