DOC-2861 added doc code samples for tdigest (#287)

* DOC-2861 added doc code samples for tdigest

* DOC-2861 removed incorrect 'using' statement automatically added

tests/Doc/Tdigest_tutorial.cs

@@ -0,0 +1,131 @@
+// EXAMPLE: tdigest_tutorial
+// HIDE_START
+
+using NRedisStack.RedisStackCommands;
+using NRedisStack.Tests;
+using StackExchange.Redis;
+
+// HIDE_END
+
+// REMOVE_START
+namespace Doc;
+[Collection("DocsTests")]
+// REMOVE_END
+
+// HIDE_START
+public class Tdigest_tutorial
+{
+
+    [SkipIfRedis(Is.OSSCluster)]
+    public void run()
+    {
+        var muxer = ConnectionMultiplexer.Connect("localhost:6379");
+        var db = muxer.GetDatabase();
+        //REMOVE_START
+        // Clear any keys here before using them in tests.
+        db.KeyDelete("racer_ages");
+        db.KeyDelete("bikes:sales");
+        //REMOVE_END
+        // HIDE_END
+
+
+        // STEP_START tdig_start
+        bool res1 = db.TDIGEST().Create("bikes:sales", 100);
+        Console.WriteLine(res1);    // >>> True
+
+        bool res2 = db.TDIGEST().Add("bikes:sales", 21);
+        Console.WriteLine(res2);    // >>> True
+
+        bool res3 = db.TDIGEST().Add("bikes:sales", 150, 95, 75, 34);
+        Console.WriteLine(res3);    // >>> true
+        // STEP_END
+
+        // Tests for 'tdig_start' step.
+        // REMOVE_START
+        Assert.True(res1);
+        Assert.True(res2);
+        Assert.True(res3);
+        // REMOVE_END
+
+
+        // STEP_START tdig_cdf
+        bool res4 = db.TDIGEST().Create("racer_ages");
+        Console.WriteLine(res4);    // >>> True
+
+        bool res5 = db.TDIGEST().Add("racer_ages",
+            45.88,
+            44.2,
+            58.03,
+            19.76,
+            39.84,
+            69.28,
+            50.97,
+            25.41,
+            19.27,
+            85.71,
+            42.63
+        );
+        Console.WriteLine(res5);    // >>> True
+
+        long[] res6 = db.TDIGEST().Rank("racer_ages", 50);
+        Console.WriteLine(string.Join(", ", res6)); // >>> 7
+
+        long[] res7 = db.TDIGEST().Rank("racer_ages", 50, 40);
+        Console.WriteLine(string.Join(", ", res7)); // >>> 7, 4
+        // STEP_END
+
+        // Tests for 'tdig_cdf' step.
+        // REMOVE_START
+        Assert.True(res4);
+        Assert.True(res5);
+        Assert.Equal("7", string.Join(", ", res6));
+        Assert.Equal("7, 4", string.Join(", ", res7));
+        // REMOVE_END
+
+
+        // STEP_START tdig_quant
+        double[] res8 = db.TDIGEST().Quantile("racer_ages", 0.5); ;
+        Console.WriteLine(string.Join(", ", res8)); // >>> 44.2
+
+        double[] res9 = db.TDIGEST().ByRank("racer_ages", 4);
+        Console.WriteLine(string.Join(", ", res9)); // >>> 42.63
+        // STEP_END
+
+        // Tests for 'tdig_quant' step.
+        // REMOVE_START
+        Assert.Equal("44.2", string.Join(", ", res8));
+        Assert.Equal("42.63", string.Join(", ", res9));
+        // REMOVE_END
+
+
+        // STEP_START tdig_min
+        double res10 = db.TDIGEST().Min("racer_ages");
+        Console.WriteLine(res10);   // >>> 19.27
+
+        double res11 = db.TDIGEST().Max("racer_ages");
+        Console.WriteLine(res11);   // >>> 85.71
+        // STEP_END
+
+        // Tests for 'tdig_min' step.
+        // REMOVE_START
+        Assert.Equal(19.27, res10);
+        Assert.Equal(85.71, res11);
+        // REMOVE_END
+
+
+        // STEP_START tdig_reset
+        bool res12 = db.TDIGEST().Reset("racer_ages");
+        Console.WriteLine(res12);   // >>> True
+        // STEP_END
+
+        // Tests for 'tdig_reset' step.
+        // REMOVE_START
+        Assert.True(res12);
+        // REMOVE_END
+
+
+        // HIDE_START
+    }
+}
+// HIDE_END
+