Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
Which values occur exactly three times?
Word Counting and Indexing
Project Euler: Problem 7, Nth prime
Energy of a photon
Replace Vector Elements
Get ranks of values in a vector
Two-output anonymous function?
Create an 'arrow-head" matrix
Raise Matrix to Power
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