*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