MATLAB调用外部exe报错求助：‘C:\Prediction.exe’未被识别

Hey there, let's break down why you're getting that error and how to fix it, plus cover the right way to call external .exe files with input/output in MATLAB.

First: Diagnose the "not recognized" Error #

The error message 'C:\Prediction.exe' is not recognized as an internal or external command... tells us MATLAB can't locate your executable file. Here's how to check:

• Verify the file path: Double-check that Prediction.exe is actually saved directly at the root of your C: drive. It's easy to accidentally save it in a subfolder like C:\MyTests\Prediction.exe instead.
• Test the path in MATLAB: Run dir('C:\Prediction.exe') in the MATLAB command window. If it returns an empty result, your path is incorrect—update it to the actual location of the .exe.
• Test in Command Prompt: Open Windows CMD and run C:\Prediction.exe directly. If it fails here too, the issue is with the .exe itself (not MATLAB) — make sure it's a standalone, working executable.

Correct Ways to Call .exe Files with Input/Output in MATLAB #

Once you've confirmed the path is right, use these methods to pass inputs and capture outputs:

1. Use the system() Function (Most Versatile) #

This is the go-to method for handling external commands, since it lets you capture execution status and output.

• Basic call (no inputs/outputs):

  status = system('C:\Full\Correct\Path\To\Prediction.exe');
  

  A status value of 0 means the command ran successfully; any non-zero value indicates an error.
• Call with input arguments:
  If your .exe accepts command-line arguments (like input file paths, parameters), append them directly:

  [status, cmdOutput] = system('C:\Full\Correct\Path\To\Prediction.exe input_data.txt output_results.txt');
  

  cmdOutput will store any text the .exe prints to the command line.
• Handle spaces in paths:
  If your .exe's folder or filename has spaces, wrap the full path in double quotes:

  system('"C:\My Test Folder\Prediction.exe"');
  

2. Use the ! Operator (Quick Shortcut) #

For simpler calls, you can use the exclamation point as a shorthand for system():

• Basic call:

  !C:\Full\Correct\Path\To\Prediction.exe
  

• With arguments:

  !C:\Full\Correct\Path\To\Prediction.exe arg1 arg2
  

3. Add the .exe Folder to MATLAB's Path #

If you don't want to type the full path every time, add the folder containing Prediction.exe to MATLAB's search path:

addpath('C:\Path\To\Your\Exe\Folder');

After this, you can call the .exe directly by name:

system('Prediction.exe');

内容的提问来源于stack exchange，提问作者Ahmad Namvar