What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Remove any row in which a NaN appears
Word Counting and Indexing
Project Euler: Problem 10, Sum of Primes
02 - Vector Variables 4
Find the index of n in magic(n)
Permute diagonal and antidiagonal
Replicate elements in vectors
Expression or variable?
Find Missing Number
How to reverse spdiags ?
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