?? zbrac.txt
字號:
Procedure ZBRAC(var X1, X2:real; SUCCES:boolean);
var
NTRY,J:integer; FACTOR,F1,F2:real;
begin
FACTOR:=1.6;
NTRY:=50;
If X1 = X2 Then ShowMessage('you have to guess an initial range');
F1:=FUN(X1);
F2:=FUN(X2);
SUCCES:=True;
For J:=1 To NTRY do
begin
If F1 * F2 < 0 Then Exit;
If Abs(F1) < Abs(F2) Then
begin
X1:=X1 + FACTOR * (X1 - X2);
F1:=FUN(X1);
end
Else
begin
X2:=X2 + FACTOR * (X2 - X1);
F2:=FUN(X2);
end;
end;
SUCCES:=False;
end;
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