unit2.pas

用于开发税务票据管理的软件

unit Unit2;

interface
procedure POLCOE(X, Y:array of real; N:integer; var COF:array of real);

implementation
procedure POLCOE(X, Y:array of real; N:integer; var COF:array of real);
var
    S:array[0..15] of real;
    I,J,K:integer;  PHI,FF,B:real;
begin
    For I:=1 To N do
    begin
        S[I]:=0;
        COF[I]:=0;
    end;
    S[N]:=-X[1];
    For I:=2 To N do
    begin
        For J:=N + 1 - I To N - 1 do
            S[J]:=S[J] - X[I] * S[J + 1];
        S[N]:=S[N] - X[I];
    end;
    For J:=1 To N do
    begin
        PHI:=N;
        For K:=N - 1 DownTo 1 do
            PHI:=K * S[K + 1] + X[J] * PHI;
        FF:=Y[J] / PHI;
        B:=1;
        For K:=N DownTo 1 do
        begin
            COF[K]:=COF[K] + B * FF;
            B:=S[K] + X[J] * B;
        end;
    end;
end;
end.