How CrossAbove

[aekzof]

Hello
this photo is the result of these lines of code in an indicator
State.SetDefaults)
AddPlot(Brushes.Red, "OpenPlot");
AddPlot(Brushes.Orange, "ClosePlot");

OnBarUpdate()

//OpenPlot[0]=Open[0]; // error in this line
//ClosePlot[0]=Close[0]; // error in this line why not work?


Values[0][0]=Open[0];
Values[1][0]=Close[0];

Unfortunately I cant create an alert when there is a crossing

this line give me all chart red!
if ( (CrossAbove( Open,Close,0))) -> Can you help me= Brushes.Red;

So i want a alert when there is across betwwen these two lines
Can you help me Can you help me
Thanks

[NinjaTrader_Kate]

Hello aekzof,

Thank you for your note.

I'm not quite sure what the errors are that you're seeing, but I do see an issue with your CrossAbove statement. You have to put at least 1 bar as the lookback, since we are comparing what has happened since the prior bar closed. Also, since we'll be looking back to prior bar values, you'll want to check that at least one bar has been processed before the CrossAbove. The following code works for me, plots the open and close, and changes the chart background to red if the Open price crosses above the Close:

protected override void OnBarUpdate()
{
if (CurrentBar < 1)
return;

OpenPlot[0] = Open[0];
ClosePlot[0] = Close[0];

if(CrossAbove(OpenPlot, ClosePlot, 1))
{
BackBrush = Brushes.Red;
}
}

Please let us know if we may be of further assistance to you.

[aekzof]

Merci it works
you are right, it takes at least a bar for it to work