Chris, I wonder how you keep coming with such new interesting problems!
I'm glad you like them!
Replace all zeros and NaNs in a matrix with the string 'error'
Sum the entries of each column of a matrix which satisfy a logical condition.
Generate a NaN...on purpose
Volume of a box
Solve an ODE: second-order linear equation with constant coefficients
Count the primes in Collatz sequences
Compute the perimeter of an ellipse
Count unique orderings of vertices of a polygon
Collect a set of candy wrappers
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