Return the sum of sum(res.y)
Tip: use bvp4c
Find the alphabetic word product
Project Euler: Problem 9, Pythagorean numbers
Sum of first n terms of a harmonic progression
Convert a vector into a number
Check if a string starts with another string
Solve the system of equations.
Find the sum of the negative elements under the main diagonal.
Return the length of the longest word in the string.
Return ! if array element starts with a certain letter. Otherwise return ?
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