/// <summary>
/// 获取阶段性的平滑值。以当前键的前边界为起始，指定的数量数据拟合。是改进的阶段平滑窗口。
/// </summary>
/// <param name="key">键</param>
/// <param name="order">拟合次数</param>
/// <param name="fitDataCount">拟合窗口大小</param>
/// <param name="marginCount">窗口边沿，不可大于窗口的一半，推荐1/4 窗口大小，最初的几个拟合采用原始的实时拟合算法，最大窗口为指定的边缘大小 </param>
/// <param name="overlapCount">重合区域数量，默认和缓冲区（edge）相同</param>
/// <param name="isOverlap">是否采用重合区域计算</param>
/// <returns></returns>
public RmsedNumeral GetSectedMovWindowPolyfitValue(int order, TKey key, int fitDataCount, int marginCount = -1, bool isOverlap = true, int overlapCount = -1)
{
if (fitDataCount < 4)
{
fitDataCount = 4;
}
if (marginCount >= fitDataCount / 2 || marginCount < 0)
{
marginCount = fitDataCount / 4;
}
if (overlapCount >= marginCount || overlapCount < 0)
{
overlapCount = marginCount / 2;
} //默认
double edgeSpan = marginCount * Interval;
double overlapSpan = overlapCount * Interval;
double keyVal = KeyToDouble(key);
int currentIndex = Geo.Utils.ListUtil.ClosestToIndexOf(this.OrderedKeys, key, KeyToDouble);
//刚开始的实时常规算法
//if (currentIndex < marginCount)
//{
// return this.GetPolyFitValue(key, order, marginCount);
//}
var builder = PolyfitBuilders.GetOrCreate(order);
if (!builder.IsFitted) //确保已经生成
{
builder = BuildPolyfitBuilder(order, currentIndex, fitDataCount, marginCount);
}
var pos = builder.GetPosition(keyVal, overlapSpan, edgeSpan);
//如果在后面的缓冲区,且后续有足够的数据，则尝试拟合下一拟合区
if (pos >= PositionOfMovingWindow.LatterOverlap)
{
var lastKeyVal = KeyToDouble(this.LastKey);
if (builder.LastKey < lastKeyVal - edgeSpan || builder.LastKey != lastKeyVal)//新建下一段拟合器
{
builder = BuildPolyfitBuilder(order, currentIndex, fitDataCount, marginCount);
}
else
{
int oo = 0;//缓存已经用完
}
}
var val = builder.GetPolyfitValue(keyVal, true, overlapSpan, edgeSpan);
return(val);
}
/// <summary>
/// 直接根据所指数据构建拟合器。由 PolyfitBuilders 统一管理。
/// </summary>
/// <param name="order"></param>
/// <param name="startIndex"></param>
/// <param name="endIndex"></param>
/// <param name="isFromTheVeryFirstKey"></param>
/// <returns></returns>
public PolyfitBuilder BuildPolyfitBuilder(int order, int startIndex = 0, int endIndex = int.MaxValue, bool isFromTheVeryFirstKey = true)
{
if (endIndex > this.Count - 1 || endIndex < 1)
{
endIndex = this.Count - 1;
}
bool hasKeyToDouble = KeyToDouble != null;
startIndex = Gdp.Utils.IntUtil.GetPositiveOrZero(startIndex);
var keys = this.OrderedKeys;
var builder = PolyfitBuilders.GetOrCreate(order);
//检查是否已有，避免重复创建
if ((hasKeyToDouble && builder.Currrent != null &&
builder.FirstKey == KeyToDouble(keys[startIndex]) &&
builder.LastKey == KeyToDouble(keys[endIndex]))
)
{
int ii = 0;
}
else
{
if (startIndex == endIndex) //防止最后历元
{
return(builder);
}
//重新生成，以当前Key为基准
var dic = new Dictionary <double, double>();
for (int i = startIndex; i <= endIndex; i++)
{
var item = keys[i];
double keyV = i;
if (hasKeyToDouble)
{
keyV = KeyToDouble(item);
}
dic.Add(keyV, this[item]);
}
builder.SetData(dic).SetIsFromTheVeryFirstKey(isFromTheVeryFirstKey);
builder.Build();
}
if (builder.Currrent.StdDev > 10)
{
log.Warn("拟合 StdDev 大啊：" + builder.Currrent.StdDev + ", " + builder.Currrent.ToString());
}
return(builder);
}