bessj0.dem

Delphi Pascal 数据挖掘领域算法包 数值算法大全

PROGRAM d6r15(input,output,dfile);
(* driver for routine BESSJ0 *)
VAR
   i,nval : integer;
   val,x : real;
   txt : string[18];
   dfile : text;

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

BEGIN
   glopen(dfile,'fncval.dat');
   REPEAT readln(dfile,txt) UNTIL (txt = 'Bessel Function J0');
   readln(dfile,nval);
   writeln (txt);
   writeln ('x':5,'actual':12,'bessj0(x)':13);
   FOR i := 1 to nval DO BEGIN
      readln(dfile,x,val);
      writeln (x:6:2,val:12:7,bessj0(x):12:7)
   END;
   close(dfile)
END.