unit2.pas

用于开发税务票据管理的软件

unit Unit2;

interface
Procedure FGAUSS(X:real; A:array of real;
                  var Y:real;var DYDA:array of real; NA:integer);

implementation
Procedure FGAUSS(X:real; A:array of real;
                  var Y:real;var DYDA:array of real; NA:integer);
var
    I,II:integer;  ARG,EX,FAC:real;
begin
    Y:=0;
    For II:=1 To (NA DIV 3) do
    begin
        I:=3*II-2;
        ARG:=(X - A[I + 1]) / A[I + 2];
        EX:=Exp(-Sqr(ARG));
        FAC:=A[I] * EX * 2 * ARG;
        Y:=Y + A[I] * EX;
        DYDA[I]:=EX;
        DYDA[I + 1]:=FAC / A[I + 2];
        DYDA[I + 2]:=FAC * ARG / A[I + 2];
    end; 
end;
end.