% Speedup2.m
% 功能：向量、矩陣或數組的動態分配與向量、矩陣或數組的預先初始化之間的運行速度比較
%
% 加快MATLAB執行程序的方法之二：在循環語句之前預先對向量、矩陣或數組初始化
%
%   Author: HUANG Huajiang
%   Copyright 2003 UNILAB Research Center, 
%   East China University of Science and Technology, Shanghai, PRC
%   $Revision: 1.0 $  $Date: 2003/04/20 $

clear all
clc

% 向量、矩陣或數組的動態分配
tic
for n = 1:32
r(n) = rank(magic(n));
end
t_dynamic = toc

% 矩陣或數組的預先初始化
tic
r = zeros(32,1);
for n = 1:32
r(n) = rank(magic(n));
end
t_preinit = toc