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Consider the MATLAB code snippet:

medium📝 Debug Q14 of 15
MATLAB - Linear Algebra
Consider the MATLAB code snippet:
A = [1 2; 3 4];
[U, S, V] = svd(A);
U = svd(A);

What is the error in this code?
AMatrix A is not square, so svd cannot be applied.
BThe second call to svd assigns a matrix to U instead of three outputs.
CThe variable V is not assigned in the second svd call.
DThe svd function requires four output variables.
Step-by-Step Solution
Solution:
  1. Step 1: Analyze the first svd call

    The first call correctly assigns three outputs: U, S, V.
  2. Step 2: Analyze the second svd call

    The second call assigns U = svd(A); which returns only singular values as a vector, not a matrix U.
  3. Final Answer:

    The second call to svd assigns a matrix to U instead of three outputs. -> Option B
  4. Quick Check:

    svd(A) alone returns singular values vector [OK]
Quick Trick: svd(A) alone returns singular values vector, not matrices [OK]
Common Mistakes:
  • Expecting svd(A) to return U matrix alone
  • Thinking svd requires square matrix only
  • Ignoring number of outputs in function call

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