数学算法

				procedure QROMB(A, B:real; var SS:real);
				CONST
				    EPS = 0.000001;    JMAX = 20;
				VAR
				    S,H:ARRAY[0..21] of real;
				    JMAXP,J,K,KM:integer;  DSS:real;
				begin
				    JMAXP:=JMAX + 1;
				    K:=5;
				    KM:=K - 1;
				    H[1]:=1;
				    For J:=1 To JMAX do
				    begin
				        TRAPZD(A, B, S[J], J);
				        If J >= K Then
				        begin
				            POLINT(H, S, K, 0, SS, DSS);
				            If (AbS(DSS) < (EPS * Abs(SS))) Then Exit;
				        end;
				        S[J + 1]:=S[J];
				        H[J + 1]:=0.25 * H[J];
				    end;
				    ShowMessage('Too many steps.');
				end;