gcf.dem

Delphi Pascal 数据挖掘领域算法包 数值算法大全

PROGRAM d6r9(input,output,dfile);
(* driver for routine GCF *)
VAR
   a,gammcf,gln,val,x : real;
   i,nval : integer;
   txt : string[25];
   dfile : text;

(*$I MODFILE.PAS *)
(*$I GAMMLN.PAS *)

(*$I GCF.PAS *)

BEGIN
   glopen(dfile,'fncval.dat');
   REPEAT readln(dfile,txt) UNTIL (txt = 'Incomplete Gamma Function');
   readln(dfile,nval);
   writeln(txt);
   writeln('a':4,'x':11,'actual':14,'gcf(a,x)':13,
      'gammln(a)':13,'gln':8);
   FOR i := 1 to nval DO BEGIN
      readln(dfile,a,x,val);
      IF (x >= (a+1.0)) THEN BEGIN
         gcf(a,x,gammcf,gln);
         writeln(a:6:2,x:12:6,(1.0-val):12:6,
            gammcf:12:6,gammln(a):12:6,gln:12:6)
      END
   END;
   close(dfile)
END.