How to negate a serie

[Achim]

I'm using the Standard Deviation function within the design-mode.
Now I'm looking for a negate function, to create a new serie with the
negated data of the StdDev-Serie.

Maybe the subtract-function with a const like

StdDevMinSerie := 0 - StdDdv

What can I do

[Narcís]

Hi Achim,

You can do something like this:

Code: Select all

  Series2.Clear;
  for i:=0 to Series1.Count-1 do
  begin
    Series2.AddXY(Series1.XValue[i], -Series1.YValue[i]);
  end;

You can also use custom function as shown in the example at All Features\Welcome!\Functions\Extended\Custom y=f(x) at the new features demo, available at TeeChart's program group.

Hope this helps!

[Achim]

You can do something like this:

Code: Select all

  Series2.Clear;
  for i:=0 to Series1.Count-1 do
  begin
    Series2.AddXY(Series1.XValue[i], -Series1.YValue[i]);
  end;

But where is the best place(event) for this code. After showing a form I set query.active to true, and then the chart is shown.

You can also use custom function as shown in the example at All Features\Welcome!\Functions\Extended\Custom y=f(x) at the new features demo, available at TeeChart's program group.

Hm.. I' cannot set the OnCalculate property, because I don't find it, neither in the chart nor at the series. In short: I need a tutorial how to find the OnCalculate property at the Objectinspector.
[/quote]

[Narcís]

Hi Achim,

But where is the best place(event) for this code. After showing a form I set query.active to true, and then the chart is shown.

You can use this code after activating the query or even in Series1 OnAfterAdd event.

Hm.. I' cannot set the OnCalculate property, because I don't find it, neither in the chart nor at the series. In short: I need a tutorial how to find the OnCalculate property at the Objectinspector.

You need to select function, for example TeeFunction1 and go to its events tab in the object inspector.

[Achim]

You can use this code after activating the query

Thanks, that works.

You need to select function, ....

I don't find it.

I drop a dbchart to a form, double-click on it -> Add.. -> functions -> y=f(x) . I get the serie1 in the serieslist.
After selecting the dbchart on the form, I saw the chart-properties in the objectinspector, but there is no property with name 'functions'. There is also the property 'SeriesList'. After selecting it, I can choose a serie and see its series-properties, even without 'functions'. Maybe I'm to stupit, but I cannot find it.

[Narcís]

Hi Achim,

No, you need to select TeeFunction1 object in the Object Inspector instead of DBChart1.

[Achim]

No, you need to select TeeFunction1 object in the Object Inspector

Wow, I've found it. It's the first time I've select a component in this way, after several 'delphi-years'. I've always select an icon or component on the form to access the properties.