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| type
TForm1 = class(TForm)
StringGrid1: TStringGrid;
StringGrid2: TStringGrid;
StringGrid3: TStringGrid;
StringGrid4: TStringGrid;
StringGrid5: TStringGrid;
StringGrid6: TStringGrid;
Button1: TButton;
Label1: TLabel;
Label2: TLabel;
Label3: TLabel;
Label4: TLabel;
Label6: TLabel;
Button2: TButton;
Button3: TButton;
Label7: TLabel;
Label8: TLabel;
Label10: TLabel;
StringGrid7: TStringGrid;
Label11: TLabel;
Label5: TLabel;
Label9: TLabel;
StringGrid8: TStringGrid;
Label12: TLabel;
StringGrid9: TStringGrid;
Label13: TLabel;
StringGrid10: TStringGrid;
Label14: TLabel;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
const N=4;
type
TVector=array[1..4] of extended;
TMatrix=array[1..4,1..4] of extended;
var
A:TMatrix=
((10*N+1, 4, 2, 2),
(4, 8, 0, 2 ),
(2, 0, 9,-4 ),
(2, 2,-4,12 ));
a2:TMatrix;
b2,F:TVector;
procedure TForm1.FormCreate(Sender: TObject);
var i,j : byte;
begin
F[1]:=2*N*SIN(N);; {Задаем вектор b}
F[2]:=5*(SIN(N)-COS(N));
F[3]:=7*(COS(N)+SIN(N));
F[4]:=3*sin(N);
a2:=a;
for i:=1 to 4 do begin
for j:=1 to 4 do begin
StringGrid1.Cells[j-1,i-1]:=FloatToStr(A[i,j]); //выводим на форму матрицу
end;
StringGrid2.Cells[0,i-1]:=FloatToStrF(F[i],ffFixed,10,15); {вектор}
end;
end;
procedure TForm1.Button3Click(Sender: TObject);
var
i,j,k,i1,j1 : byte; det,s:extended;
SumB,SumC,Sum,SumX,SumY: extended;
x,y,r,e : array[1..4] of extended;
B,C : array[1..4,1..4] of extended;
begin
Button1.Enabled:=true;
{Обнулить B и C}
for i:=1 to 4 do
for j:=1 to 4 do begin
B[i,j]:=0;
C[i,j]:=0;
end;
{Матрицы B и C}
for i:=1 to 4 do begin
B[i,1]:=A[i,1];
C[1,i]:=A[1,i]/B[1,1];
end;
for i:=2 to 4 do
for j:=i to 4 do begin
SumB:=0;
SumC:=0;
for k:=1 to i-1 do begin
SumB:=SumB+B[j,k]*C[k,i];
SumC:=SumC+B[i,k]*C[k,j];
end;
B[j,i]:=A[j,i]-SumB;
if i=j then C[i,j]:=1 else C[i,j]:=(A[i,j]-SumC)/B[i,i];
end;
{Вектор y}
y[1]:=F[1]/B[1,1];
for i:=2 to 4 do begin
SumY:=0;
for k:=1 to i-1 do SumY:=SumY+B[i,k]*y[k];
y[i]:=(F[i]-SumY)/B[i,i];
end;
{Вектор x}
x[4]:=y[4];
for i:=3 downto 1 do begin
SumX:=0;
for k:=i+1 to 4 do SumX:=SumX+C[i,k]*x[k];
x[i]:=y[i]-SumX;
end;
{Вектор невязки}
for i:=1 to 4 do begin
r[i]:=0;
for j:=1 to 4 do r[i]:=r[i]+A[i,j]*x[j];
r[i]:=r[i]-F[i];
end;
{Вывод на форму матриц B и C}
for i:=1 to 4 do
for j:=1 to 4 do begin
StringGrid4.Cells[j-1,i-1]:=FloatToStrF(B[i,j],ffFixed,10,5);
StringGrid5.Cells[j-1,i-1]:=FloatToStrF(C[i,j],ffFixed,10,5);
end;
det:=1;
s:=1;
for i:=1 to n do
s:=s*b[i,i];
det:=det*s;
Label5.caption:=floattostrf(det,ffnumber,10,1);
For i1:=1 to 4 do //ОБРАТНАЯ
begin for j1:=1 to 4 do if i1=j1 then e[j1]:=1 else e[j1]:=0;
y[1]:=e[1]/b[1,1];
for i:=2 to 4 do
begin Sum:=0;
for k:=1 to i-1 do Sum:=Sum+b[i,k]*y[k];
y[i]:=(e[i]-Sum)/b[i,i];
end;
x[4]:=y[4];
StringGrid8.Cells[i1-1,3]:=Floattostrf(x[4],fffixed,9,5);
for i:=3 downto 1 do
begin sum:=0;
for k:=i+1 to 4 do sum:=sum+c[i,k]*x[k];
x[i]:=y[i]-sum;
StringGrid8.Cells[i1-1,i-1]:=Floattostrf(x[i],fffixed,9,5);
end;
end;
for i:=1 to 4 do //ПРОВЕРКА ОБРАТНОЙ
for j:=1 to 4 do
begin
sum:=0;
for k:=1 to 4 do
Sum:=Sum+strtofloat(StringGrid1.cells[k-1,i-1])*strtofloat( StringGrid8.cells[j-1,k-1]);
StringGrid9.Cells[j-1,i-1]:=FloattoStrf(Sum,fffixed,9,3);
end;
for i:=1 to 4 do //В*С
for j:=1 to 4 do
begin
sum:=0;
for k:=1 to 4 do
Sum:=Sum+strtofloat(StringGrid4.cells[k-1,i-1])*strtofloat( StringGrid5.cells[j-1,k-1]);
StringGrid10.Cells[j-1,i-1]:=FloattoStrf(Sum,fffixed,9,3);
end;
{Вывод корней x, невязки r}
for i:=1 to 4 do begin
StringGrid3.Cells[0,i-1]:=FloatToStrF(x[i],ffFixed,14,7);
StringGrid6.Cells[0,i-1]:=FloatToStr(r[i]);
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;
procedure TForm1.Button1Click(Sender: TObject); // metod yakobi
Var Z,v:Array[1..4] of extended;
y:Array[1..4,0..200] of extended;
i,j,k:integer;
sum1,sum2:extended;
const eps=0.000001;
begin
for i:=1 to 4 do
for j:=0 to 1 do y[i,j]:=Int(Strtofloat(StringGrid3.Cells[0,i-1]));
for i:=1 to 4 do
for j:=1 to 4 do
A[i,j]:=StrToFloat(Stringgrid1.cells[j-1,i-1]);
for i:=1 to 4 do
Z[i]:=StrToFloat(Stringgrid2.cells[0,i-1]);
k:=0;
repeat
k:=k+1;
For i:=1 to 4 do
begin
sum1:=0;
sum2:=0;
for j:=1 to i-1 do
sum1:=sum1+A[i,j]*y[j,k];
for j:=i+1 to 4 do
sum2:=sum2+A[i,j]*y[j,k];
y[i,k+1]:=z[i]/A[i,i]-(sum1+sum2)/A[i,i];
end;
until
(Abs(y[1,k+1]-y[1,k])+Abs(y[2,k+1]-y[2,k])+
Abs(y[3,k+1]-y[3,k])+Abs(y[4,k+1]-y[4,k])<eps);
for i:=1 to 4 do
Stringgrid7.cells[0,i-1]:=Floattostrf(y[i,k+1],ffnumber,15,7); //печать решения
for i:=1 to 4 do //невязка
begin
v[i]:=0;
for j:=1 to 4 do
v[i]:=v[i]+a[i,j]*y[j,k+1];
v[i]:=v[i]-z[i];
Stringgrid6.cells[0,i-1]:=Floattostrf(v[i],ffnumber,15,4); //печать невязки
end;
Label1.caption:='Число итераций = '+inttostr(k+1);
end;
end. |