/// <summary>
/// 获取差别矩阵
/// </summary>
public DiffMatrix getDiffMatrix(List <double> valLength)
{
DiffMatrix matrix = new DiffMatrix(); //差别矩阵
int sampleNum = trainCollection.Count; //相似样本个数
//组合训练样本
for (int i = 0; i < sampleNum - 1; i++)
{
DataRow first = trainCollection[i];
for (int j = i + 1; j < sampleNum; j++)
{
DataRow second = trainCollection[j];
//计算差别
if (!first[0].ToString().Equals(second[0].ToString()))//决策属性不同
{
//产生差别矩阵元素
DiffMatrixElem elem = new DiffMatrixElem(i, j);
int keyNum = keyCollection.Count;
for (int k = 1; k < keyNum; k++)//第0号属性是决策属性，不是关键属性
{
//关键属性
DataColumn keyAttr = keyCollection[k];
if (keyAttr.DataType.ToString().Equals("System.Single") ||
keyAttr.DataType.ToString().Equals("System.Double") ||
keyAttr.DataType.ToString().Equals("System.Int32"))
{
//提取浮点数据
double a = Convert.ToDouble(first[k]);
double x = Convert.ToDouble(second[k]);
//计算差别程度
//double diff = Math.Abs(Math.Abs(x - a) / a);
double diff = 0;
if (valLength[k - 1] != 0)
{
diff = Math.Abs(x - a) / valLength[k - 1];
}
if (diff > 0) //有区别,没有约简，置为0
{
elem.addDiffAttr(k, diff); //添加差别属性
}
}
else
{
//文本二元化
if (!first[k].ToString().Equals(second[k].ToString()))
{
elem.addDiffAttr(k, 1);//添加差别属性
}
}
}
//添加差别元素
matrix.addElem(elem);
}
}
}
//matrix.write();
return(matrix);
}
/// <summary>
/// 添加矩阵元素
/// </summary>
/// <param name="e">添加的元素</param>
public void addElem(DiffMatrixElem e)
{
diff.Add(e);
}