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Why does COO format allow duplicate entries for the same (row, col) coordinate?

hard📝 Conceptual Q10 of 15
SciPy - Sparse Matrices (scipy.sparse)
Why does COO format allow duplicate entries for the same (row, col) coordinate?
ABecause duplicates cause errors in COO format
BBecause COO automatically merges duplicates on creation
CBecause COO stores raw data and duplicates are summed on conversion
DBecause COO stores only unique entries by design
Step-by-Step Solution
Solution:

  1. Step 1: Understand COO storage behavior

    COO format stores raw coordinate and data arrays, allowing duplicates.

  2. Step 2: Duplicate handling on conversion

    Duplicates are summed when converting COO to CSR or CSC formats.

  3. Final Answer:

    Because COO stores raw data and duplicates are summed on conversion -> Option C

  4. Quick Check:

    Duplicates allowed in COO, summed later [OK]
Quick Trick: Duplicates allowed in COO, summed when converted [OK]
Common Mistakes:
MISTAKES
  • Thinking COO merges duplicates immediately
  • Assuming duplicates cause errors
  • Believing COO stores only unique entries

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