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).
surface of a spherical planet
Back to basics 21 - Matrix replicating
Magic is simple (for beginners)
Number of digits in an integer
Cyclic element of
Evaluating continued fractions
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