std2.m

来自「有关matlab的电子书籍有一定的帮助希望有用」· M 代码 · 共 22 行

function s = std2(a)
%STD2 Compute standard deviation of matrix elements.
%   B = STD2(A) computes the standard deviation of the values in
%   A.
%
%   Class Support
%   -------------
%   A is an array of class uint8 or double. B is a scalar of
%   class double.
%
%   See also CORR2, MEAN2, MEAN, STD.

%   Clay M. Thompson 10-6-92
%   Copyright 1993-1998 The MathWorks, Inc.  All Rights Reserved.
%   $Revision: 5.8 $  $Date: 1997/11/24 15:36:25 $

if (~isa(a,'double'))
    a = double(a);
end

s = std(a(:));