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MQL5 リファレンス行列とベクトルのメソッド行列とベクトルの操作NormalizeDouble 

NormalizeDouble

Rounding matrix/vector elements to a specified accuracy. For complex numbers, the real and imaginary parts are normalized separately. Returns matrix/vector with normalized elements;

vector vector::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
vectorf vectorf::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
vectorc vectorc::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
vectorcf vectorcf::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
matrix matrix::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
matrixf matrixf::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
matrixc matrixc::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );
 
matrixcf matrixcf::NormalizeDouble(
  int            digits      // number of digits after decimal point
  );

Parameters

digits

[in]  Accuracy format, number of digits after point (0-11).

Return Value

Matrix/vector with normalized values.

Example

  matrixf a={{ 1, 1, 2, 3, 4},
             { 1, 2, 5, 6, 7},
             { 2, 5, 3, 9,10},
             { 3, 6, 9, 4, 5},
             { 4, 7,10, 5, 5}};
  matrixf ai=a.Inv();
//--- result matrix should be an identity matrix
  matrixf aai=a@ai;
  Print(aai);
//--- replace small values
  matrixf aain=aai.NormalizeDouble(5);
//--- accurate identity matrix
  Print("identity matrix\n",aain);
 
/*
[[0.99999976,0,0,-2.3841858e-07,0]
[-4.1723251e-07,1,1.8626451e-09,-5.9604645e-08,2.3841858e-07]
[-1.0728836e-06,-1.1920929e-07,0.99999994,-8.3446503e-07,4.7683716e-07]
[-2.9802322e-07,5.9604645e-08,-3.9115548e-08,0.99999958,0]
[-5.9604645e-08,-5.9604645e-08,4.2840838e-08,-6.5565109e-07,1.0000002]]
identity matrix
[[1,0,0,0,0]
[0,1,0,0,0]
[0,0,1,0,0]
[0,0,0,1,0]
[0,0,0,0,1]]
*/