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Pastable version of Fast Haar Wavelet Transform

<pre class='prettyprint' language='ruby'>def haar_1d(a) r = [] (Math.log(a.length) / Math.log(2) - 1).to_i.downto(0) { |j| as = [] ad = [] (1 &lt;&lt; j).times { |k| u = 2 * k au = a[u] * 0.5 av = a[u + 1] * 0.5 as &lt;&lt; au + av ad &lt;&lt; au - av } a = as r = ad + r } a + r end</pre> <a href="http://www.refactormycode.com/codes/719-fast-haar-wavelet-transform" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>