In Your solution the last row contains 4. So probably You'd like to delete rows with at least one element smaller than 4.
Remove white space from the string
Sum the Digits of a Number
07 - Common functions and indexing 4
Solving Quadratic Equations (Version 1)
Vectors counting by 2
Duplicate each element of a vector.
Create a matrix X, where each column is a shifted copy of the vector v
First non-zero element in each column
Find the elements of a matrix according to a defined property.
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