DEFINITION MODULE ComplexMath;

  (* Mathematical functions for the type COMPLEX *)
 
CONST
  i =    CMPLX (0.0, 1.0);
  one =  CMPLX (1.0, 0.0);
  zero = CMPLX (0.0, 0.0);

PROCEDURE abs (z: COMPLEX): REAL;
  (* Returns the length of z *)

PROCEDURE arg (z: COMPLEX): REAL;
  (* Returns the angle that z subtends to the positive real axis *)
 
PROCEDURE conj (z: COMPLEX): COMPLEX;
  (* Returns the complex conjugate of z *)
 
PROCEDURE power (base: COMPLEX; exponent: REAL): COMPLEX;
  (* Returns the value of the number base raised to the power exponent *)

PROCEDURE sqrt (z: COMPLEX): COMPLEX;
  (* Returns the principal square root of z *)

PROCEDURE exp (z: COMPLEX): COMPLEX;
  (* Returns the complex exponential of z *)

PROCEDURE ln (z: COMPLEX): COMPLEX;
  (* Returns the principal value of the natural logarithm of z *)

PROCEDURE sin (z: COMPLEX): COMPLEX;
  (* Returns the sine of z *)

PROCEDURE cos (z: COMPLEX): COMPLEX;
  (* Returns the cosine of z *)

PROCEDURE tan (z: COMPLEX): COMPLEX;
  (* Returns the tangent of z *)

PROCEDURE arcsin (z: COMPLEX): COMPLEX;
  (* Returns the arcsine of z *)

PROCEDURE arccos (z: COMPLEX): COMPLEX;
  (* Returns the arccosine of z *)

PROCEDURE arctan (z: COMPLEX): COMPLEX;
  (* Returns the arctangent of z *)

PROCEDURE polarToComplex (abs, arg: REAL): COMPLEX;
  (* Returns the complex number with the specified polar coordinates *)

PROCEDURE scalarMult (scalar: REAL; z: COMPLEX): COMPLEX;
  (* Returns the scalar product of scalar with z *)

PROCEDURE IsCMathException (): BOOLEAN;
  (* Returns TRUE if the current coroutine is in the exceptional execution state
     because of the raising of an exception in a routine from this module; otherwise
     returns FALSE.
  *)

END ComplexMath.

