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