MATLAB - File I/O
You want to save a matrix to a file and then load it back in MATLAB. Which sequence of commands correctly achieves this?
You want to save a matrix to a file and then load it back in MATLAB. Which sequence of commands correctly achieves this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Open file for writing and write matrix with type
Open with fileID = fopen('matrix.dat', 'w'); then fwrite(fileID, matrix, 'double'); fclose(fileID). Specify data type 'double'.Step 2: Open file for reading and read matrix with size and type
Open with fileID = fopen('matrix.dat', 'r'); then matrix2 = fread(fileID, [size(matrix,1), size(matrix,2)], 'double'); fclose(fileID).Final Answer:
fileID = fopen('matrix.dat', 'w'); fwrite(fileID, matrix, 'double'); fclose(fileID); fileID = fopen('matrix.dat', 'r'); matrix2 = fread(fileID, [size(matrix,1), size(matrix,2)], 'double'); fclose(fileID); -> Option AQuick Check:
Open-write-close, then open-read-close with types = correct [OK]
Quick Trick: Always specify fileID and data type when reading/writing matrices [OK]
Common Mistakes:
- Not assigning fopen result to fileID
- Using wrong file modes for reading/writing
- Omitting data type in fwrite or fread
- Calling fwrite without fileID
Master "File I/O" in MATLAB
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore MATLAB Quizzes