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).
Find the alphabetic word product
All your base are belong to us
peta to nano (x-ray)
What is the distance from point P(x,y) to the line Ax + By + C = 0?
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