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).
Make a random, non-repeating vector.
mathematics , probability problem
Sum the elements in either diagonal of a square matrix
Create an 'arrow-head" matrix
Leap years on other planets
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