MATLAB Quiz
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Questions and Answers

What is the output of the code snippet?

  • [2 3; 5 6; 8 9] (correct)
  • [1 2; 4 5; 7 8]
  • [2 5 8; 3 6 9]
  • [1 4 7; 2 5 8]

If a = [1 2 3; 4 5 6; 7 8 9], what does 'b = a(:,[2 3])' result in?

  • [1 2; 4 5; 7 8]
  • [1 4 7; 2 5 8]
  • [2 3; 5 6; 8 9] (correct)
  • [2 5 8; 3 6 9]

What does 'a(:,[2 3])' do in MATLAB?

  • Selects all rows and elements 2 and 3 from matrix a
  • Selects all elements in column 2 and 3 from matrix a
  • Selects all columns and rows 2 and 3 from matrix a
  • Selects all rows and columns 2 and 3 from matrix a (correct)

Study Notes

MATLAB Code Snippet

  • Given a matrix a = [1 2 3; 4 5 6; 7 8 9]
  • The code b = a(:, [2 3]) extracts columns 2 and 3 from matrix a and assigns the result to b

MATLAB Matrix Operations

  • a(:, [2 3]) is a MATLAB syntax to extract columns 2 and 3 from matrix a
  • The : operator denotes all rows, while [2 3] specifies the columns to extract

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Description

Test your knowledge of MATLAB with this quiz. Determine the output of the code snippet and understand the functionality of 'a(:,[2 3])'. If a = [1 2 3; 4 5 6; 7 8 9], what does 'b = a(:,[2 3])' result in?

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