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You want to write a large numeric array to a file and read it back efficiently in MATLAB. Which combination is best for speed and accuracy?

hard📝 Application Q9 of 15
MATLAB - File I/O
You want to write a large numeric array to a file and read it back efficiently in MATLAB. Which combination is best for speed and accuracy?
AUse csvwrite to write CSV and csvread to read CSV
BUse fprintf to write text and fscanf to read text
CUse save to write .mat and load to read .mat
DUse fwrite to write binary and fread to read binary
Step-by-Step Solution
Solution:

  1. Step 1: Consider efficiency for large numeric data

    Binary file operations (fwrite/fread) are faster and more accurate than text.

  2. Step 2: Compare options

    fprintf/fscanf and csvwrite/csvread are slower and may lose precision; save/load is good but slower for large data.

  3. Final Answer:

    Use fwrite to write binary and fread to read binary -> Option D

  4. Quick Check:

    Fast numeric I/O = fwrite/fread binary [OK]
Quick Trick: Binary fwrite/fread is fastest for large numeric arrays [OK]
Common Mistakes:
  • Using text functions for large data
  • Assuming save/load is always fastest
  • Ignoring precision loss in CSV

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