How to list and load only the first file in folder?

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Dawid Strzelczyk 2020-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/518385-how-to-list-and-load-only-the-first-file-in-folder

评论： Dawid Strzelczyk 2020-4-23

Hello,

I have about 1500 image files in a folder and listing all using dir() last too long and sometimes crashes the AppDesigner. Is there a way to list only the first image or the first n images at a given time?

Dawid

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Stephen23 2020-4-23

在 MATLAB Online 中打开

"I have about 1500 image files in a folder and listing all using dir() last too long and sometimes crashes the AppDesigner."

This is not the fault ot dir, it is the fault of a badly written GUI.

I regularly use dir to return the names (and other data) on many thousands of files at once, it never causes a problem.

"Is there a way to list only the first image or the first n images at a given time?"

Basic MATLAB indexing:

S = dir(..);
S(1).name

Dawid Strzelczyk 2020-4-23

The files are on a server and for someone with bad internet connection the loading last about 1-2 minutes.

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Answer 1

Sahithi Kanumarlapudi 2020-4-23

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在 MATLAB Online 中打开

Hi,

By using the 'dir' function, you would know the number of files present in the folder. You can then access the required number of files using a loop and by accessing the 'name' property of the file. The following might serve you as an example for displaying the names of first 'n' files.

dirFiles = dir(folderpath);
for i = 1:n
    disp(dirFiles(i).name)
end

Similarly you can use other properties like 'folder' to perform your required operation. For more information on 'dir' method refer to the following link

https://www.mathworks.com/help/matlab/ref/dir.html#bup_80o-1

Hope this helps!