qgaus.dem

来自「Delphi Pascal 数据挖掘领域算法包 数值算法大全」· DEM 代码 · 共 31 行

PROGRAM d4r7(input,output);
(* driver for routine QGAUS *)
CONST
   x1=0.0;
   x2=5.0;
   nval=10;
VAR
   dx,ss,x : real;
   i : integer;

FUNCTION func(x: real): real;
BEGIN
   func := x*exp(-x)
END;

(*$I MODFILE.PAS *)
(*$I QGAUS.PAS *)

BEGIN
   dx := (x2-x1)/nval;
   writeln;
   writeln('0.0 to','qgaus':10,'expected':13);
   writeln;
   FOR i := 1 to nval DO BEGIN
      x := x1+i*dx;
      qgaus(x1,x,ss);
      writeln(x:5:2,ss:12:6,(-(1.0+x)*exp(-x)
         +(1.0+x1)*exp(-x1)):12:6)
   END
END.