Leap years

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A quick function that when provided a numeric vector of years returns a boolean vector where TRUE == Leap year.

is.leapyear=function(year){
  #http://en.wikipedia.org/wiki/Leap_year
  return(((year %% 4 == 0) & (year %% 100 != 0)) | (year %% 400 == 0))
}

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