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What is wrong with this MATLAB code snippet?

medium📝 Debug Q7 of 15
MATLAB - Linear Algebra
What is wrong with this MATLAB code snippet?
A = [1 2 3; 4 5 6];
[U, S, V] = svd(A);
disp(S(3,3));
ASVD cannot be computed for non-square matrices
BIndexing S(3,3) is invalid because S is 2x3 and does not have a (3,3) element
CVariable S is not assigned by svd
DNo error; code runs correctly
Step-by-Step Solution
Solution:
  1. Step 1: Check size of matrix S from SVD of A

    For a 2x3 matrix A, S is 2x3 with singular values on the diagonal.
  2. Step 2: Validate indexing of S

    Since S has only 2 rows, accessing S(3,3) is invalid and causes an indexing error.
  3. Final Answer:

    Indexing S(3,3) is invalid because S is 2x3 and does not have a (3,3) element -> Option B
  4. Quick Check:

    Check matrix size before indexing [OK]
Quick Trick: Check matrix size before accessing elements [OK]
Common Mistakes:
  • Assuming S is square for non-square A
  • Ignoring MATLAB indexing errors
  • Thinking SVD only works for square matrices

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