create a matrix with the name a=[1 0 2; 3 0 4] and swap the first line with the second in matlab

To create matrix a with the given values, we can write:

main.m
a = [1 0 2; 3 0 4];
20 chars
2 lines

To swap the first row with the second row, we can use the following code:

main.m
a([1 2], :) = a([2 1], :);
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2 lines

The a([1 2], :) represents the first and second rows of matrix a. Similarly, a([2 1], :) represents the second and first rows of matrix a. By swapping these rows, we effectively swap the first row with the second in the matrix.