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WINGSLDLL_API double gsl_stats_mean (const double data[], const size_t stride, const size_t n);
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function gsl_stats_mean(const data:array of double; const stride:DWORD; const n:DWORD):double;stdcall;External 'WinGsl.dll';
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procedure TForm1.Button2Click(Sender: TObject);
var
  td:array of double;
  s:string;
begin
  setlength(td,5);
  td[0]:=1;
  td[1]:=6.235;
  td[2]:=1;
  td[3]:=2;
  td[4]:=1;
  s:=floattostr(gsl_stats_mean(td,1,5));
  edit2.Text:=s;
end;
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