Using loops to populate a vector
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Say I have a 3x2 matrix (A) that ranges from the numbers 1 through 5. The 3 rows equals 3 different sets of numbers. I have to use a loop to populate a vector (B) that is the size 3x1 (3 for each set). This vector will populate with the first number in each set (every number in the first column).
So if the matrix A =
the vector B should be
How would you use the loop function to do that?