This should be quite straightforward but at 2a.m. my brains are not working 100%. ;)
I has exactly the same idea!!
but on the second line I used directly the logical indexing... ;-)
Which values occur exactly three times?
So many choices
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 19 - character types
Solve the set of simultaneous linear equations
Order of things - 2
Number of problems
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Add a row of zeros on top of a matrix
Create a random logical vector of N elements of which M are true.
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