d1r12.txt

用于开发税务票据管理的软件

implementation
//PROGRAM D1R12
//Driver for routine SSOR
uses
  unit2;
  {$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
    A,Q,C:matrx2;
    B,R,X:Array[0..5] of real;
    I,J,II:Integer;     OM:real;
    F:TextFile;
const
    s1='%10.1f'; s2='%13.4f';  s3='##0';
    N = 5; EPS = 0.1E-7;
begin
  setlength(A ,6,6);
  setlength(Q ,6,6);
  setlength(C ,6,6);
  OM:=1.3;  //松弛因子
  //输入已知的方程组的系数矩阵
  A[1, 1]:=1; A[1, 2]:=1; A[1, 3]:=0; A[1, 4]:=0; A[1, 5]:=0;
  A[2, 1]:=1; A[2, 2]:=2; A[2, 3]:=1; A[2, 4]:=0; A[2, 5]:=0;
  A[3, 1]:=0; A[3, 2]:=1; A[3, 3]:=3; A[3, 4]:=1; A[3, 5]:=0;
  A[4, 1]:=0; A[4, 2]:=0; A[4, 3]:=1; A[4, 4]:=4; A[4, 5]:=1;
  A[5, 1]:=0; A[5, 2]:=0; A[5, 3]:=0; A[5, 4]:=1; A[5, 5]:=5;
  //输入已知的方程组的右端向量B
  B[1]:=2;       B[2]:=4;
  B[3]:=5;       B[4]:=6;
  B[5]:=6;
  //输出计算结果到文件
  AssignFile(F, 'd:\delphi_shu\p1\d1r12.dat');
  Rewrite(F);
  Writeln(F, '已知的方程组的右端向量');
  For I:= 1 To N do
    Writeln(F,Format(s1,[B[I]]));
  For I:=1 To N do
  begin
      For J:=1 To N do
        C[I,J]:= A[I, J];
  end;
  For I:=1 To N do
  begin
      R[I]:= B[I];
      X[I]:= 0;
  end;
  SSOR(C,N,R,X,EPS,OM,II);
  Writeln(F, '计算出的方程组的解');
  For I:= 1 To N do
    Writeln(F,Format(s2,[X[I]]));
  Writeln(F, '将计算出的解乘以系数矩阵，以验证计算结果');
  For I:=1 To N do
  begin
      B[I]:=0;
      For J:=1 To N do
        B[I]:=B[I] + A[I, J] * X[J];
  end;
  For I:= 1 To N do
    Writeln(F,Format(s1,[B[I]]));
  Writeln(F,'迭代次数= ',FormatFloat(s3,II));
  CloseFile(F);
  //屏幕显示计算结果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p1\d1r12.dat');
end;