/// <summary>
/// 値の計算。
/// </summary>
public virtual ValueType this[VariableTable t]
{
get
{
return(this.GetValue(t.GetParameterList()));
}
}
/// <summary>
/// 値の計算。
/// </summary>
public virtual ValueType this[VariableTable t]
{
get
{
return this.GetValue(t.GetParameterList());
}
}
/// <summary>
/// 指定した範囲内/刻み幅で、関数 f の値が最小になるような引数を探す。
/// (総当り)
/// </summary>
/// <param name="f">関数 f</param>
/// <param name="rangeList">探索範囲/刻み幅</param>
/// <returns>argmin f</returns>
public static VariableTable Argmin(Function f, params Range[] rangeList)
{
VariableTable vars = new VariableTable();
foreach (Range range in rangeList)
{
vars[range.variable] = range.min;
}
ValueType min = ValueType.MaxValue;
VariableTable argmin = null;
for (;;)
{
ValueType val = f[vars];
if (val < min)
{
min = val;
argmin = vars.Clone();
}
int i = 0;
for (; i < rangeList.Length; ++i)
{
ValueType x = vars[rangeList[i].variable];
x += rangeList[i].step;
if (x > rangeList[i].max)
{
vars[rangeList[i].variable] = rangeList[i].min;
}
else
{
vars[rangeList[i].variable] = x;
break;
}
}
if (i >= rangeList.Length)
{
break;
}
}
return(argmin);
}
/// <summary>
/// 指定した範囲内/刻み幅で、関数 f の値が最小になるような引数を探す。
/// (総当り)
/// </summary>
/// <param name="f">関数 f</param>
/// <param name="rangeList">探索範囲/刻み幅</param>
/// <returns>argmin f</returns>
public static VariableTable Argmin(Function f, params Range[] rangeList)
{
VariableTable vars = new VariableTable();
foreach(Range range in rangeList)
{
vars[range.variable] = range.min;
}
ValueType min = ValueType.MaxValue;
VariableTable argmin = null;
for(;;)
{
ValueType val = f[vars];
if(val < min)
{
min = val;
argmin = vars.Clone();
}
int i=0;
for(; i<rangeList.Length; ++i)
{
ValueType x = vars[rangeList[i].variable];
x += rangeList[i].step;
if(x > rangeList[i].max)
{
vars[rangeList[i].variable] = rangeList[i].min;
}
else
{
vars[rangeList[i].variable] = x;
break;
}
}
if(i >= rangeList.Length) break;
}
return argmin;
}