polin2.dem

Delphi Pascal 数据挖掘领域算法包 数值算法大全

PROGRAM d3r9 (input,output);
(* driver for routine POLIN2 *)
CONST
   n=5;
   pi=3.1415926;
TYPE
   glmarray = ARRAY [1..n] OF real;
   glnarray = glmarray;
   glmbyn = ARRAY [1..n,1..n] OF real;
VAR
   i,j : integer;
   dy,f,x1,x2,y : real;
   x1a,x2a : glmarray;
   ya : glmbyn;

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

(*$I POLIN2.PAS *)

BEGIN
   FOR i := 1 to n DO BEGIN
      x1a[i] := i*pi/n;
      FOR j := 1 to n DO BEGIN
         x2a[j] := 1.0*j/n;
         ya[i,j] := sin(x1a[i])*exp(x2a[j])
      END
   END;
(* test 2-dimensional interpolation *)
   writeln;
   writeln ('Two dimensional interpolation of sin(x1)exp(x2)');
   writeln;
   writeln ('x1':9,'x2':12,'f(x)':13,'interpolated':16,'error':11);
   FOR i := 1 to 4 DO BEGIN
      x1 := (-0.1+i/5.0)*pi;
      FOR j := 1 to 4 DO BEGIN
         x2 := -0.1+j/5.0;
         f := sin(x1)*exp(x2);
         polin2(x1a,x2a,ya,n,n,x1,x2,y,dy);
         writeln (x1:12:6,x2:12:6,f:12:6,y:12:6,dy:15:6)
      END;
      writeln ('***********************************');
   END
END.