Input n: is an positive integer which serves as the dimension of the matrix A;
Output: A=(Aij),where each entry Aij is either 1 or -1 which is generated
For n<1 the function should deliver an empty matrix.
Check if number exists in vector
Create a vector whose elements depend on the previous element
Detect a number and replace with two NaN's
Make a 1 hot vector
dir with recursive subdirectory search
Travelling Salesman Problem (TSP)
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