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class SimpleLinearRegression | |
def initialize(xs, ys) | |
@xs, @ys = xs, ys | |
if @xs.length != @ys.length | |
raise "Unbalanced data. xs need to be same length as ys" | |
end | |
end | |
def y_intercept | |
mean(@ys) - (slope * mean(@xs)) |
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require 'date' | |
# Actually doesn't matter WHAT you choose as the epoch, it | |
# won't change the algorithm. Just don't change it after you | |
# have cached computed scores. Choose something before your first | |
# post to avoid annoying negative numbers. Choose something close | |
# to your first post to keep the numbers smaller. This is, I think, | |
# reddit's own epoch. | |
$our_epoch = Time.local(2005, 12, 8, 7, 46, 43).to_time |
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# Function to print strftime results | |
def print_strftime_formats(a,cur_date) | |
a.each do |format| | |
b = "%#{format}" | |
output = cur_date.strftime(b) | |
puts "t.strftime('#{b}'), => #{output}" | |
end | |
end | |
a = ('a'..'z').to_a |