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Questions and Answers
What is the output of the code snippet?
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?
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?
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)
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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 matrixaand assigns the result tob
MATLAB Matrix Operations
a(:, [2 3])is a MATLAB syntax to extract columns 2 and 3 from matrixa- The
:operator denotes all rows, while[2 3]specifies the columns to extract
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