bessj.dem

Delphi Pascal 数据挖掘领域算法包 数值算法大全

PROGRAM d6r20(input,output,dfile);
(* driver for routine BESSJ *)
VAR
   i,n,nval : integer;
   val,x : real;
   txt : string[18];
   dfile : text;

(*$I MODFILE.PAS *)
(*$I BESSJ0.PAS *)

(*$I BESSJ1.PAS *)

(*$I BESSJ.PAS *)

BEGIN
   glopen(dfile,'fncval.dat');
   REPEAT readln(dfile,txt) UNTIL (txt = 'Bessel Function Jn');
   readln(dfile,nval);
   writeln(txt);
   writeln('n':4,'x':7,'actual':14,'bessj(n,x)':18);
   FOR i := 1 to nval DO BEGIN
      readln(dfile,n,x,val);
      writeln(n:4,x:8:2,'   ',val:13,'   ',bessj(n,x):13)
   END;
   close(dfile)
END.