how to copy a specific files from one folder to another folder?

I have Folder name as 8PSK and it contain 5000 files. but i need first 3500 files (frame_snr-108PSK101: frame_snr-108PSK3500) to copy to another folder.

8PSK

frame_snr-108PSK101

frame_snr-108PSK102

frame_snr-108PSK103

...... frame_snr-108PSK5000

i have tried the below code but it gives me random 3500 file, Although i need first files from 101 to 3500

filePattern = fullfile('E:\SNR-Dataset\DATA-11-time\time-data-training\8PSK\8PSK', '*.mat');
dest = 'E:\SNR-Dataset\DATA-11-time\time-data-training\8PSK\8PSK\8PSK'
% Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 101 : 3600
    baseFileName = theFiles(k).name;
    fullFileName = fullfile(theFiles(k).folder, baseFileName);
    copyfile( fullFileName, dest)
end

Please Assist

Answer 1

[Simon Chan]

Try the following:

filePattern = fullfile('E:\SNR-Dataset\DATA-11-time\time-data-training\8PSK\8PSK', '*.mat');
dest = 'E:\SNR-Dataset\DATA-11-time\time-data-training\8PSK\8PSK\8PSK'
% Change to whatever pattern you need.
theFiles = dir(filePattern);
%
nameFiles = {theFiles.name};
[num,pos] = sort(cellfun(@(x) str2double(extractBetween(x,'frame_snr-108PSK','.txt')),nameFiles));
startnum = 101;                                 
finishnum = 3600;                   
fileindex = pos(num>=startnum & num<=finishnum);
for k = 1:numel(fileindex)
    baseFileName = theFiles(fileindex(k)).name;
    fullFileName = fullfile(theFiles(k).folder, baseFileName);
    copyfile( fullFileName, dest)
end