public IMatrix Multiply(IVectorMatrix right1)
{
var result = new VectorMatrix(right1.Count);
for (int i = 0; i < result.Count; i++)
{
result[i] = right1[i] * this[i];
}
return(result);
}
//public IMatrix Plus(IMatrix right)
//{
// throw new NotImplementedException();
//}
//public IMatrix Minus(IMatrix right)
//{
// throw new NotImplementedException();
//}
//public IMatrix Multiply(IMatrix right)
//{
// throw new NotImplementedException();
//}
public IMatrix SubMatrix(int fromIndex, int count)
{
var vm = new VectorMatrix(count);
var endIndexExcluded = fromIndex + count;
for (int i = fromIndex, j = 0; i < endIndexExcluded; i++, j++)
{
vm.Data[j] = this.Data[i];
}
return(vm);
}
IMatrix IArithmeticOperation <IMatrix> .Opposite()
{
VectorMatrix matrix = new VectorMatrix(this.Count);
int count = this.Count;
for (int i = 0; i < count; i++)
{
matrix[i] = -this[i];
}
return(matrix);
}
IMatrix IArithmeticOperation <IMatrix> .Divide(double right)
{
VectorMatrix matrix = new VectorMatrix(this.Count);
int count = this.Count;
for (int i = 0; i < count; i++)
{
matrix[i] = this[i] / right;
}
return(matrix);
}
/// <summary>
/// 返回新的乘法结果。
/// </summary>
/// <param name="right"></param>
/// <returns></returns>
public IMatrix Multiply(VectorMatrix right)
{
int row = this.RowCount;
int col = this.ColCount;
IMatrix matrix = new ArrayMatrix(row, 1);
for (int i = 0; i < row; i++)
{
matrix[i, 0] = this[i, i] * right[i, 0];
}
return(matrix);
}
/// <summary>
/// 矩阵乘法，左边列数应该等于右边行
/// N * 1 列向量，只乘以 1 * M 的行向量，结果为 N*M 的矩阵。
/// </summary>
/// <param name="right"></param>
/// <returns></returns>
public IMatrix Multiply(IMatrix right)
{
if (ColCount != right.RowCount)
{
throw new ArgumentException("维数不正确！不可及操作。");
}
if (right.ColCount == 1)//返回仍然为列向量
{
VectorMatrix matrix = new VectorMatrix(this.Count);
double val = right[0, 0];
for (int i = 0; i < this.Count; i++)
{
matrix[i] = this[i] * val;
}
return(matrix);
}
ArrayMatrix my = new ArrayMatrix(this);
return(my.Multiply(right));
}
public IMatrix Minus(IMatrix right)
{
if (right == null)
{
return(this);
}
if (this.RowCount != right.RowCount ||
ColCount != right.ColCount
)
{
throw new ArgumentException("维数不正确！不可及操作。");
}
VectorMatrix matrix = new VectorMatrix(this.Count);
int count = this.Count;
for (int i = 0; i < count; i++)
{
matrix[i] = this[i] - right[i, 0];
}
return(matrix);
}