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# Commands for using postgresql on mac os x (installed via brew).

# Start postgresql
pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

# Status
pg_ctl -D /usr/local/var/postgres status

# Stop postgresql
pg_ctl -D /usr/local/var/postgres stop

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fn swap(arr: &mut Vec<int>, i: uint, j: uint) -> &Vec<int> {
    let buf = arr[i];
    arr[i] = arr[j];
    arr[j] = buf;
    arr
}

fn insertion_sort1(arr: &mut Vec<int>) -> &Vec<int> {
    for i in range(1, arr.len()) {
        let key = arr[i];

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puma -w 4 --preload --port 3000

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require 'matrix'

def polynomial_regression x, y, degree
  rows = x.map do |i|
    (0..degree).map { |power| (i ** power).to_f }
  end
  mx, my = Matrix.rows(rows), Matrix.columns([y])
  ((mx.transpose * mx).inv * mx.transpose * my).transpose.row(0).to_a.reverse
end

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ActiveRecord::Base.logger = Logger.new(STDOUT)

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SELECT * FROM pg_class, pg_index WHERE pg_index.indisvalid = false AND pg_index.indexrelid = pg_class.oid;