Question

是否可以创建通过文件名模式过滤文件的mat文件的filedatastore？到目前为止，我明白了：

private func setupView()
{
    let path = URL(fileURLWithPath: Bundle.main.path(forResource: "mydogwalkvideo", ofType: ".mp4")!)

    let player = AVPlayer(url: path)

    let newLayer = AVPlayerLayer(player: player)
    newLayer.frame = self.videoView.frame
    self.videoView.layer.addSublayer(newLayer)
    newLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill //It's set to resize aspect to fill

    player.play()
    player.actionAtItemEnd = AVPlayer.ActionAtItemEnd.none


    NotificationCenter.default.addObserver(self, selector: #selector(ViewController.videoDidPlayToEnd(notification:)), name: NSNotification.Name(rawValue: "AVPlayerItemDidPlayToEndTimeNotification"), object: player.currentItem)

}

@objc func videoDidPlayToEnd(notification: Notification)
{
    let player: AVPlayerItem = notification.object as! AVPlayerItem
    player.seek(to: CMTime.zero)
}

但是我将不使用的一些mat文件很大，因此减慢了该过程。我无法将所有文件移动到1个目录，因为我的目录结构如下：

fds = fileDatastore(dir_save,'ReadFcn',@load,'FileExtensions','.mat','IncludeSubfolders',true);
f=1;
while hasdata(fds)
        disp(num2str(progress(fds)*100) 
        dataarray = read(fds);
        if ~isempty(strfind(fds.Files{f},myPattern))
            %% do somthing
        end
        f=f+1;
end

Answer 1

您可以在对fullfile的呼叫中使用通配符。使用fileDatastore文档中的示例：

% No filtering
>> fds = fileDatastore(fullfile(matlabroot,'toolbox','matlab','demos'),'ReadFcn',@load,'FileExtensions','.mat')
fds = 

  FileDatastore with properties:

                       Files: {
                              'E:\MATLAB64\R2018b\toolbox\matlab\demos\accidents.mat';
                              'E:\MATLAB64\R2018b\toolbox\matlab\demos\airfoil.mat';
                              'E:\MATLAB64\R2018b\toolbox\matlab\demos\airlineResults.mat'
                               ... and 37 more
                              }
                 UniformRead: 0
                     ReadFcn: @load
    AlternateFileSystemRoots: {}

% Filtering for .mat files starting with "w"
>> fds = 

fileDatastore(fullfile(matlabroot,'toolbox','matlab','demos','w*'),'ReadFcn',@load,'FileExtensions','.mat')
fds = 

  FileDatastore with properties:

                       Files: {
                              'E:\MATLAB64\R2018b\toolbox\matlab\demos\west0479.mat';
                              'E:\MATLAB64\R2018b\toolbox\matlab\demos\wind.mat'
                              }
                 UniformRead: 0
                     ReadFcn: @load
    AlternateFileSystemRoots: {}

要检查不同的文件夹，请使用两个通配符：

>> !mkdir d01
>> !mkdir d02
>> !touch d01/file1.mat
>> !touch d01/myPatternFile.mat
>> !touch d02/file2.mat
>> !touch d02/myPatternFile.mat
>> fileDatastore(fullfile(pwd,'d*\myPattern*'),'ReadFcn',@load,'FileExtensions','.mat')
ans = 

  FileDatastore with properties:

                       Files: {
                              'H:\Documents\56133896\d01\myPatternFile.mat';
                              'H:\Documents\56133896\d02\myPatternFile.mat'
                              }
                 UniformRead: 0
                     ReadFcn: @load
    AlternateFileSystemRoots: {}

在Matlab中创建Mat文件的filedatastore，按文件名模式过滤文件

1 个答案: