Renaming a field in a structure array
Find state names that start with the letter N
Generate a vector like 1,2,2,3,3,3,4,4,4,4
MATCH THE STRINGS (2 CHAR) very easy
Area of a triangle
First non-zero element in each column
Create a matrix X, where each column is a shifted copy of the vector v
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Duplicate each element of a vector.
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