Скачать или смотреть How to Use uipickfiles in MATLAB App Designer for File Selection and Reading

Discover how to effectively use MATLAB's `uipickfiles` function in App Designer to select folders and read text files into a matrix or table.
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Mastering File Selection in MATLAB App Designer with uipickfiles

Creating applications in MATLAB App Designer can be an exciting journey, especially when dealing with data files. One common requirement is to allow users to select folders and read the contents of text files within. If you're tackling this challenge and have come across the uipickfiles function, you're in the right place! Today, we'll explore how to utilize this tool effectively in your app, along with how to read text files and store their contents in a table or matrix.

The Problem: Reading Text Files from Selected Folders

Many users face similar challenges when developing their apps. In particular, a common inquiry is about selecting one or more folders and subsequently reading all the text files within those folders. Your question, which involves the functionality of the uipickfiles and how best to deal with the outputs it generates, is a great starting point.

You noted that the function returns a 1x1 cell containing the path to the selected folder (or folders), which can be unhelpful in directly accessing the files within. The aim is not only to select the folders but also to read all relevant text files inside them and organize this data efficiently—perhaps into a matrix or table.

The Solution: Using uipickfiles and Directory Functions

While uipickfiles helps you select folders, you need some additional code to access the files contained in those folders. Below are the steps you can follow to achieve this functionality.

Step 1: Selecting Folders

First, use uipickfiles to allow users to select one or more folders, as demonstrated in the code snippet below:

[[See Video to Reveal this Text or Code Snippet]]

This command opens a dialog box where users can choose folders, returning a cell array of folder paths.

Step 2: Identifying and Storing Text Files

Next, for each folder selected, retrieve the text files using the dir function along with wildcard matching to filter for .txt files. You can employ a simple loop for this operation. Here’s how you can implement it:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Reading the Text Files into a Matrix or Table

Now that you have gathered all the file names, the next step is to read their contents. You can use either readtable if the files are structured, or readmatrix for numeric data. Here's an example to read the data:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With this approach, you should be able to efficiently select folders and access the text files within for further processing in your MATLAB App. Remember, effective use of uipickfiles combined with directory functions can significantly enhance your app's functionality.

Feel free to adjust the filters and file-reading commands based on the specific structure and type of your text files. Happy coding, and enjoy developing your MATLAB app!