Guess the formula to transform strings as follows:
'Hello World!' --> 'Ifmmp Xpsme!'
'Can I help you?' --> 'Dbo J ifmq zpv?'
Simple and interesting.
Filter AC, pass DC
Who knows the last digit of pi?
frame of the matrix
What number has this problem?
Get ranks of values in a vector
Create an 'arrow-head" matrix
Count up then down
Replace multiples of 5 with NaN
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