Steema Central

I am trying to create a histogram from a set of data but I cant seem to get it to work. I have typically about 1000 floating point numbers in the array MyLog which is declared in another unit (unit1). The following is sample code: The line
Series2.FunctionType:= TeeFunction1;
cause the program to hang up. I obviously dont understand something about how to make histograms and plot from a simple array.


unit Histogram;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, TeCanvas,ExtCtrls, TeeProcs, TeEngine, Chart,TeeHistogram,
Series, StatChar, ComCtrls, TeeEdit,QDialogs;

type
THistogramFunctionForm = class(TForm)
Chart1: TChart;
Series2: THistogramSeries;
StatusBar1: TStatusBar;
ChartEditor1: TChartEditor;


procedure FormActivate(Sender: TObject);

private
{ Private declarations }
public
{ Public declarations }
end;

var
HistogramFunctionForm: THistogramFunctionForm;

implementation

uses Unit1;

{$R *.dfm}



procedure THistogramFunctionForm.FormActivate(Sender: TObject);
var i,j: integer;
TeeFunction1 : THistogramFunction;
begin
TeeFunction1.NumBins := 20;
TeeFunction1.Cumulative := False;
Series2.Clear;
for i:=1 to Engine.Num do
Series2.Add(MyLog,'');
Series2.FunctionType:= TeeFunction1;

end;

end.

Hi glazer,

You shouldn't add data to Series2, this is the function series and TeeChart will use it to automatically calculate and plot the required function. I recommend you to read Tutorial 7 - Working with Functions. Tutorials can be found at TeeChart's program group.

If this doesn't help don't hesitate to let us know.

Thanks. Yes it was an elementary mistake. Problem is now solved. Many thanks