Constant line(MIN(BB bandwidth, period))

[Precisely]

With my limited programming skills I'm trying to plot the minimum value of an indicator looking back n periods. I would like that value as a constant line. Any ideas? Tried to modify the constant line indicator without any success. Shouldn't be too difficult, or?

[NinjaTrader_Bertrand]

Precisely, do you get any errors in your code or as you apply the script? Did you add an index to the MIN method to return a double value and not a dataseries?

[Precisely]

Oh, I get a lot of errors I'm afraid... I think the core issue though is what you suggest; to index the MIN method. But how do i do that? Using the private double method, or? I'd really appreciate if you could give me an example then I can fiddle with it a bit more.

[NinjaTrader_JoshP]

MIN(some parameters)[0]

The red index tells the code to use the latest min value as seen on the most current bar.

[Precisely]

Thank you both for your replies. I'm almost there now, but it doesn't exactly do what I want. Here is the code:

#region Variables

privateint minperiod = 100;

#endregion

protectedoverridevoid Initialize()
{
Add(new Plot(Color.FromKnownColor(KnownColor.Orange), PlotStyle.Line, "Plot0"));
CalculateOnBarClose = true;
Overlay = false;
PriceTypeSupported = false;
}

protectedoverridevoid OnBarUpdate()
{
double minimum = MIN(Bollingerbandwidth(2,14), minperiod)[0];
Plot0.Set(minimum);

Please take a look at this picture I uploaded: http://www.pixbox.se/pic_show_id29954163.html If you look at the 2nd last panel you'll see the "constant" minimum value plotted. You see that there is a drop in the last values. Why is that? It is set on exclude weekends and calculate on bar close: false.

[NinjaTrader_Bertrand]

Please open the called Bollingerbandwidth script and remove any CalculateOnBarClose reference from the Initialize() - then recompile, and reload the indicator you created fresh by pressing F5 on the chart. Does the value stay stable now?

[Precisely]

Sweet. Yes they do. Thx!

[Precisely]

Well, it appears it doesn't really do what I want it to do (se the simple code below).

I would like it to take the minimum value of Bollingerband n days back (including checking the latest close) and plot that value as a constant line (for all days), like a support line.

protectedoverridevoid OnBarUpdate()
{
double minimum = MIN(Bollingerbandwidth(2,18), minperiod)[0];
Plot0.Set(minimum);
}

Possible?

[NinjaTrader_Bertrand]

Precisely, it seems like you would need to higher then a higher lookback setting for the MIN() method to incorporate more bars back into creating those support / resistance levels.

[Precisely]

I'm only interested in the minimum for the last 100 days or so, but it works as it is, simply not a beautiful solution. But I guess creating a constant line gets too complicated for me anyways. Thanks for your reply.

[NinjaTrader_Bertrand]

You're welcome, then use just DrawLine() in the indicator and no unique tagID > thus you always modify the one plotted line in value and thus might look cleaner for your current evaluation.

http://www.ninjatrader-support.com/HelpGuideV6/DrawLine.html