FORTRAN Reference Manual

Intrinsic Functions
FORTRAN Reference Manual—528615-001
8-11
CONJG Function
Considerations
•
If you specify two arguments, they must be the same type: integer, real, or double
precision. The data type of the value returned by CMPLX is always complex.
•
For one argument of complex type, CMPLX (x) returns x. For one argument of
integer, real, or double precision type, CMPLX (x) is equivalent to CMPLX (x, 0).
•
If you specify both arguments, CMPLX (x, y) returns a complex number with a
real part equal to REAL (x) and an imaginary part equal to REAL (y).
Example of the CMPLX Function
REAL a
COMPLEX x
READ (*, *) a
x = CMPLX (a)
CONJG Function
The CONJG function returns the conjugate of a complex number.
z
is an arithmetic expression of complex type.
Considerations
•
If the argument is z = CMPLX (x, y), then the value of CONJG (z) is defined as
CMPLX (x, - y)
•
Note that for any complex number z = CMPLX (x, y),
CABS (z) =
and
z * CONJG (z) = CMPLX (x
2
+ y
2
, 0)
Example of the CONJG Function
COMPLEX a, b
b = CONJG (a)
CONJG ( z )
REAL Z
∗
CONJG Z()()