FYI: The fastest solution mentioned at the problem description uses a lookup-table. Don't beat yourself too much.
Hello, William. I like very much the originality & especially the efficiency of your approach here. Am I correct in thinking that the existing code would struggle to correctly decode a message that was encoded from (say) "Beware of the Sasquatch Man's involvement in Operation Phoenix"? [I don't want to explain this, to avoid giving too many clues to others. But I hope you get my point.] Although I am confident you could tweak your code (if necessary) to handle such cases. —DIV
Great Circle Distance
Set some matrix elements to zero
Check if number exists in vector
Anyone for tennis? Your chances of winning a (standard) game
Just take it easy for a second or two!
Guess the number I'm thinking of (Part 2)
Code breaker, Part III: Operation Xiangliu
Curve fitting (non-linear functions) & function handles
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