NDArray: added missing GetData(int[])

Author: Nucs

src/NumSharp.Core/Backends/NDArray.cs

@@ -496,6 +496,13 @@ public NDArray[] GetNDArrays(int axis = 0)
         /// <returns>reference to internal storage as System.Array</returns>
         public IArraySlice GetData() => Storage.GetData();
 
+        /// <summary>
+        ///     Gets a NDArray at given <paramref name="indices"/>.
+        /// </summary>
+        /// <param name="indices">The coordinates to the wanted value</param>
+        /// <remarks>Does not copy, returns a memory slice - this is similar to this[int[]]</remarks>
+        public NDArray GetData(params int[] indices) => new NDArray(Storage.GetData(indices)) {tensorEngine = this.tensorEngine};
+
         /// <summary>
         ///     Retrieves value of type <see cref="bool"/>.
         /// </summary>