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DataPRO/FftSharp/Windows/Rectangular.cs

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+namespace FftSharp.Windows
+{
+    public class Rectangular : Window, IWindow
+    {
+        public override string Name => "Rectangular";
+        public override string Description =>
+            "The rectangular window (sometimes known as the boxcar or Dirichlet window) is the simplest window, " +
+            "equivalent to replacing all but N values of a data sequence by zeros, making it appear as though " +
+            "the waveform suddenly turns on and off. This window preserves transients at the start and end of the signal.";
+
+        protected override double windowValue(int index, int size)
+        {
+            return 1;
+        }
+    }
+}