moment.dem

Delphi Pascal 数据挖掘领域算法包 数值算法大全

PROGRAM d13r0(input,output);
(* driver for routine MOMENT *)
CONST
   pi=3.14159265;
   npts=5000;
   nbin=100;
   nppnb=5100;   (* nppnb=npts+nbin *)
TYPE
   narray = ARRAY [1..nppnb] OF real;
VAR
   adev,ave,curt,sdev,skew : real;
   vrnce,x : real;
   i,j,k,nlim : integer;
   data : narray;

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

BEGIN
   i := 1;
   FOR j := 1 to nbin DO BEGIN
      x := pi*j/nbin;
      nlim := round(sin(x)*pi/2.0*npts/nbin);
      FOR k := 1 to nlim DO BEGIN
         data[i] := x;
         i := i+1
      END
   END;
   writeln('moments of a sinusoidal distribution');
   writeln;
   moment(data,npts,ave,adev,sdev,vrnce,skew,curt);
   writeln('calculated':39,'expected':11);
   writeln;
   writeln('Mean :',' ':19,ave:12:4,pi/2.0:12:4);
   writeln('Average Deviation :',' ':6,adev:12:4,(pi/2.0)-1.0:12:4);
   writeln('Standard Deviation :',' ':5,sdev:12:4,0.683667:12:4);
   writeln('Variance :',' ':15,vrnce:12:4,0.467401:12:4);
   writeln('Skewness :',' ':15,skew:12:4,0.0:12:4);
   writeln('Kurtosis :',' ':15,curt:12:4,-0.806249:12:4)
END.