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

Pascal/Delphi Source File | 1991-04-29 | 354b | 16 lines

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