[Solved] Consider this MATLAB code snippet:fid = fopen('data.txt'); C = textscan(fid, '%d %d'); fclose(fid);What is the likely cause if MATLAB returns an error: File identifier is not valid.? | MATLAB

MATLAB - File I/O

Consider this MATLAB code snippet:

fid = fopen('data.txt');
C = textscan(fid, '%d %d');
fclose(fid);

What is the likely cause if MATLAB returns an error: File identifier is not valid.?

Atextscan cannot read numeric data

BThe format specifier '%d %d' is invalid

Cfclose was called before textscan

DThe file 'data.txt' does not exist or path is incorrect

Step-by-Step Solution

Solution:

Step 1: Understand fopen error
If fopen fails to open the file, it returns -1, an invalid file identifier.
Step 2: Check error cause
This usually happens if the file does not exist or the path is wrong.
Final Answer:
The file 'data.txt' does not exist or path is incorrect -> Option D
Quick Check:
Invalid file ID = missing file [OK]

Quick Trick: Check file existence before fopen [OK]

Common Mistakes:

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