d1r7.txt

《Delphi常用数值算法集》的配书源码

implementation
//PROGRAM D1R7
//Driver for routine TOEPLZ
uses
  unit2;
  {$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
    X,Y:Array[0..5] of real; R:Array[0..10] of double;
    I,J:Integer;   SUM1:real;
    F:TextFile;
const
    s1='%10.4f'; s2='.###00e+00';  N = 5;  N2 = 10;
begin
  //输入已知的方程组的系数矩阵
  For I:=1 To N2-1 do
    R[I]:= 1 / I;
  //输入已知的方程组的右端向量B
  For I:=1 To N do
    Y[I]:= 0.1 * I;
  //输出计算结果到文件
  AssignFile(F, 'd:\delphi_shu\p1\d1r7.dat');
  Rewrite(F);
  Writeln(F, '已知的方程组的右端向量B');
  For I:= 1 To N do
    Writeln(F,Format(s1,[Y[I]]));
  TOEPLZ(R,X,Y,N);
  Writeln(F, '计算出的方程组的解');
  For I:= 1 To N do
    Writeln(F,'     ',FormatFloat(s2,X[I]));
  Writeln(F, '将计算出的解B乘以系数矩阵，以验证计算结果正确');
  Writeln(F, '解乘以系数矩阵','         方程组的右端向量');
  For I:=1 To N do
  begin
      SUM1:=0;
      For J:=1 To N do
      begin
        SUM1:=SUM1 + R[N+I-J]*X[J];
      end;
      Writeln(F,Format(s1,[SUM1]),'           ',Format(s1,[Y[I]]));
  end;
  CloseFile(F);
  //屏幕显示计算结果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p1\d1r7.dat');
end;