Write a function that returns that number of rows in a vector or matrix x
x = [1; 2; 3]
output = 3
matrix of natural number
Create a vector
Replace every 3rd element in a vector with 4
Matlab Basics II - Log and natural log
Matlab Basics - Pick out parts of a vector
Matlab Basics - Logical Tests I
Matlab Basics II - 3 Dimensional Arrays
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