Write a function that returns that number of rows in a vector or matrix x
x = [1; 2; 3]
output = 3
frame of the matrix
What number has this problem?
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics II - Free Fall
Matlab Basics - Absolute Value
Replace every 3rd element in a vector with 4
Matlab Basics - Create a row vector
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