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).
Vectorizing, too easy or too hard?
Penny flipping - calculate winning probability (easy)
Is it a number?
Cyclic element of
Leap years on other planets
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