mirror of
https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
synced 2025-01-19 19:22:28 +01:00
39 lines
1.3 KiB
FortranFixed
39 lines
1.3 KiB
FortranFixed
|
*DECK CLBETA
|
||
|
|
COMPLEX FUNCTION CLBETA (A, B)
|
||
|
|
C***BEGIN PROLOGUE CLBETA
|
||
|
|
C***PURPOSE Compute the natural logarithm of the complete Beta
|
||
|
|
C function.
|
||
|
|
C***LIBRARY SLATEC (FNLIB)
|
||
|
|
C***CATEGORY C7B
|
||
|
|
C***TYPE COMPLEX (ALBETA-S, DLBETA-D, CLBETA-C)
|
||
|
|
C***KEYWORDS FNLIB, LOGARITHM OF THE COMPLETE BETA FUNCTION,
|
||
|
|
C SPECIAL FUNCTIONS
|
||
|
|
C***AUTHOR Fullerton, W., (LANL)
|
||
|
|
C***DESCRIPTION
|
||
|
|
C
|
||
|
|
C CLBETA computes the natural log of the complex valued complete beta
|
||
|
|
C function of complex parameters A and B. This is a preliminary version
|
||
|
|
C which is not accurate.
|
||
|
|
C
|
||
|
|
C Input Parameters:
|
||
|
|
C A complex and the real part of A positive
|
||
|
|
C B complex and the real part of B positive
|
||
|
|
C
|
||
|
|
C***REFERENCES (NONE)
|
||
|
|
C***ROUTINES CALLED CLNGAM, XERMSG
|
||
|
|
C***REVISION HISTORY (YYMMDD)
|
||
|
|
C 770701 DATE WRITTEN
|
||
|
|
C 861211 REVISION DATE from Version 3.2
|
||
|
|
C 891214 Prologue converted to Version 4.0 format. (BAB)
|
||
|
|
C 900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
|
||
|
|
C***END PROLOGUE CLBETA
|
||
|
|
COMPLEX A, B, CLNGAM
|
||
|
|
C***FIRST EXECUTABLE STATEMENT CLBETA
|
||
|
|
IF (REAL(A) .LE. 0.0 .OR. REAL(B) .LE. 0.0) CALL XERMSG ('SLATEC',
|
||
|
|
+ 'CLBETA', 'REAL PART OF BOTH ARGUMENTS MUST BE GT 0', 1, 2)
|
||
|
|
C
|
||
|
|
CLBETA = CLNGAM(A) + CLNGAM(B) - CLNGAM(A+B)
|
||
|
|
C
|
||
|
|
RETURN
|
||
|
|
END
|