In Your solution the last row contains 4. So probably You'd like to delete rows with at least one element smaller than 4.
Make a 1 hot vector
Given a 4x4 matrix, swap the two middle columns
Is the input divisible by 3?
Maximum value in a matrix
Create a matrix X, where each column is a shifted copy of the vector v
First non-zero element in each column
Duplicate each element of a vector.
Find the elements of a matrix according to a defined property.
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