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MQL4 Reference

MQL4 Math & Trig (1)

A set of mathematical and trigonometric functions.

 

MathAbs()

double MathAbs(double value)

Returns the absolute value (modulus) of the specified numeric value.

Parameters:

value - Numeric value. 

Sample:

  double dx=-3.141593, dy;
  // calc MathAbs
  dy=MathAbs(dx);
  Print("The absolute value of ",dx," is ",dy);
  // Output: The absolute value of -3.141593 is 3.141593

MathArccos()

double MathArccos(double x)

The MathArccos function returns the arccosine of x within the range 0 to π (in radians). If x is less than -1 or exceeds 1, the MathArccos returns NaN (indeterminate value).

Parameters:

x - Value between -1 and 1 the arccosine of which to be calculated. 

Sample:

  double x=0.32696, y;
  y=asin(x);
  Print("Arcsine of ",x," = ",y);
  y=acos(x);
  Print("Arccosine of ",x," = ",y);
  //Output: Arcsine   of 0.326960=0.333085
  //Output: Arccosine of 0.326960=1.237711

MathArcsin()

double MathArcsin(double x)

The MathArcsin function returns the arcsine of x in the range -π/2 to π/2 radians. If x is less than -1 or exceeds 1, the arcsine returns NaN (indeterminate value).

Parameters:

x - Value the arcsine of which to be calculated. 

Sample:

  double x=0.32696, y;
  y=MathArcsin(x);
  Print("Arcsine of ",x," = ",y);
  y=acos(x);
  Print("Arccosine of ",x," = ",y);
  //Output: Arcsine   of 0.326960=0.333085
  //Output: Arccosine of 0.326960=1.237711

MathArctan()

double MathArctan(double x)

The MathArctan returns the arctangent of x. If x is 0, MathArctan returns 0. MathArctan returns a value within the range of -π/2 to π/2 radians.

Parameters:

x - A number representing a tangent. 

Sample:

  double x=-862.42, y;
  y=MathArctan(x);
  Print("Arctangent of ",x," is ",y);
  //Output: Arctangent of -862.42 is -1.5696

MathCeil()

double MathCeil(double x)

The MathCeil function returns a numeric value representing the smallest integer that exceeds or equals to x.

Parameters:

x - Numeric value. 

Sample:

  double y;
  y=MathCeil(2.8);
  Print("The ceil of 2.8 is ",y);
  y=MathCeil(-2.8);
  Print("The ceil of -2.8 is ",y);
  /*Output:
    The ceil of 2.8 is 3
    The ceil of -2.8 is -2*/

MathCos()

double MathCos(double value)

Returns the cosine of the specified angle.

Parameters:

value - An angle measured in radians. 

Sample:

  double pi=3.1415926535;
  double x, y;
  x=pi/2;
  y=MathSin(x);
  Print("MathSin(",x,") = ",y);
  y=MathCos(x);
  Print("MathCos(",x,") = ",y);
  //Output: MathSin(1.5708)=1
  //        MathCos(1.5708)=0

MathExp()

double MathExp(double d)

Returns the value of e raised to the power of d. At overflow, the function returns INF (infinity), and it returns 0 at underflow.

Parameters:

d - A number specifying the power. 

Sample:

  double x=2.302585093,y;
  y=MathExp(x);
  Print("MathExp(",x,") = ",y);
  //Output: MathExp(2.3026)=10

MathFloor()

double MathFloor(double x)

The MathFloor function returns a numeric value representing the largest integer that is less than or equal to x.

Parameters:

x - Numeric value. 

Sample:

  double y;
  y=MathFloor(2.8);
  Print("The floor of 2.8 is ",y);
  y=MathFloor(-2.8);
  Print("The floor of -2.8 is ",y);
  /*Output:
    The floor of 2.8 is 2
    The floor of -2.8 is -3*/

MathLog()

double MathLog(double x)

The MathLog function returns the natural logarithm of x if successful. If x is negative, these functions return NaN (indeterminate value). If x is 0, they return INF (infinity).

Parameters:

x - Value logarithm of which to be found. 

Sample:

  double x=9000.0,y;
  y=MathLog(x);
  Print("MathLog(",x,") = ", y);
  //Output: MathLog(9000)=9.10498
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