matlab多个文件图写到一个文件夹

clear;
clc;
%fin = fopen('E:/Personal/Desktop/test1.txt','wt');
imgDataPath = 'E:/Personal/Desktop/zhong/';
outdir = 'E:/Personal/Desktop/photo3';%图片路径
imgDataDir = dir(imgDataPath); % 遍历所有文件

for i=0:499 %********100
imgDir = dir([imgDataPath,'/', num2str(i) '/*.jpg']); % ********100
for j =1:length(imgDir)%图
img = imread([imgDataPath,'/', num2str(i) '/' imgDir(j).name]);%*********100
newname = [outdir,'/',num2str(i),'_',imgDir(j).name];%图片路径********100
imwrite(img,newname);%图片
end
end