chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
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+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+using QuantConnect.Data;
+using QuantConnect.Data.Market;
+using QuantConnect.Indicators;
+
+namespace QuantConnect.Algorithm.CSharp
+{
+    /// <summary>
+    /// This algorithm demonstrates using the history provider to retrieve data
+    /// to warm up indicators before data is received.
+    /// </summary>
+    /// <meta name="tag" content="indicators" />
+    /// <meta name="tag" content="history" />
+    /// <meta name="tag" content="history and warm up" />
+    /// <meta name="tag" content="using data" />
+    public class WarmupHistoryAlgorithm : QCAlgorithm
+    {
+        private ExponentialMovingAverage fast, slow;
+
+        /// <summary>
+        /// Initialise the data and resolution required, as well as the cash and start-end dates for your algorithm. All algorithms must initialized.
+        /// </summary>
+        public override void Initialize()
+        {
+            SetStartDate(2013, 10, 07);  //Set Start Date
+            SetEndDate(2013, 10, 11);    //Set End Date
+            SetCash(100000);             //Set Strategy Cash
+            // Find more symbols here: http://quantconnect.com/data
+            AddSecurity(SecurityType.Forex, "EURUSD", Resolution.Second);
+
+            fast = EMA("EURUSD", 60);
+            slow = EMA("EURUSD", 3600);
+
+            // 3601 because rolling window waits for one to fall off the back to be considered ready
+            var history = History<QuoteBar>("EURUSD", 3601);
+            foreach (var bar in history)
+            {
+                fast.Update(bar.EndTime, bar.Close);
+                slow.Update(bar.EndTime, bar.Close);
+            }
+
+            Log($"FAST IS {(fast.IsReady ? "" : "NOT")} READY. Samples: {fast.Samples.ToStringInvariant()}");
+            Log($"SLOW IS {(slow.IsReady ? "" : "NOT")} READY. Samples: {slow.Samples.ToStringInvariant()}");
+        }
+
+        /// <summary>
+        /// OnData event is the primary entry point for your algorithm. Each new data point will be pumped in here.
+        /// </summary>
+        /// <param name="data">Slice object keyed by symbol containing the stock data</param>
+        public override void OnData(Slice slice)
+        {
+            if (fast > slow)
+            {
+                SetHoldings("EURUSD", 1);
+            }
+            else
+            {
+                SetHoldings("EURUSD", -1);
+            }
+        }
+    }
+}