Define a function that behaves in the same way as mean(x) and mean(x,d) except that it ignores NaNs (unless all of the values being averaged are NaNs, in which case the result for those values should be NaN).
Check to see if a Sudoku Puzzle is Solved
Determine if a Given Number is a Triangle Number
Omit columns averages from a matrix
Back to basics 11 - Max Integer
Leap years on other planets
Evaluating continued fractions
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