From: Brian Buckley <briankbuckley@...>
Date: 2006-02-01T11:18:45+09:00
Subject: Re: memoize (reposting via ML)

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I added a "sleep 1" line to zeta to exaggerate the time of an uncached
method call.

It is working.

--Brian Buckley

def zeta(x)
  sleep 1
  r2d =3D 360.0/(2.0*Math::PI) # Radians to degrees
  2.0*(Math.sin(x/r2d))*(Math.cos(x/r2d))
end

t1 =3D Time.now
10.times { z =3D zeta(2.0) }
t2 =3D Time.now

memoize(:zeta)

t3 =3D Time.now
10.times { z =3D zeta(2.0) }
t4 =3D Time.now

memoize(:zeta,"z.cache")
t5 =3D Time.now
10.times { z =3D zeta(2.0) }
t6 =3D Time.now

puts "#{t2 - t1}, #{t4 - t3}, #{t6 - t5}" # =3D> 10.0, 1.0, 0.0

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