This function evaluates the sine Fresnel integral.

Function Value Return

FRESS — Function value.   (Output)

Required Arguments

X — Argument for which the function value is desired.   (Input)

FORTRAN 90 Interface

Generic:                              FRESS (X)

Specific:                             The specific interface names are S_FRESS and D_FRESS.

FORTRAN 77 Interface

Single:                                FRESS (X)

Double:                              The double precision function name is DFRESS.

Description

The sine Fresnel integral is defined to be

All values of x are legal.

Example

In this example, S(1.75) is computed and printed.

 

      USE FRESS_INT

      USE UMACH_INT

 

      IMPLICIT   NONE

!                                 Declare variables

      INTEGER    NOUT

      REAL       VALUE, X

!                                 Compute

      X     = 1.75

      VALUE = FRESS(X)

!                                 Print the results

      CALL UMACH (2, NOUT)

      WRITE (NOUT,99999) X, VALUE

99999 FORMAT (' FRESS(', F6.3, ') = ', F6.3)

      END

Output

 

FRESS( 1.750) =  0.499

 

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