Pascal Super Library/Pascal Super Library (CW International)(1997).bin/MATH/NRPAS13/GAMMQ.PAS

Pascal/Delphi Source File | 1991-04-29 | 352b | 16 lines

FUNCTION gammq(a,x: real): real;
VAR
   gamser,gln: real;
BEGIN
   IF ((x < 0.0) OR (a <= 0.0)) THEN BEGIN
      writeln('pause in GAMMQ - invalid arguments'); readln
   END;
   IF (x < a+1.0) THEN BEGIN
      gser(a,x,gamser,gln);
      gammq := 1.0-gamser
   END ELSE BEGIN
      gcf(a,x,gamser,gln);
      gammq := gamser
   END
END;