Simple Compiling Error

[texasnomad]

Hey guys,

I'm a bit new to ninjascript, just can't seem to get past this simple error. I keep getting CS1502 "The best overloaded method match...". I tried removing the index bracket on sdev, I tried using the
Stat.StdDev function... I'm stumped on this simple issue. Please help.

barLookBack is an int input set to 300

protected override void OnBarUpdate()
{
double closeOpen = Close[1] - Open[1] ;
double sdev = StdDev(closeOpen, barLookBack)[0] ;
Plot0.Set(sdev);
}

[NinjaTrader_Ben]

Hello,


closeOpen needs to be a DataSeries. To understand how to set up a data series please visit this link:

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

StdDev() needs a DataSeries as the first argument. This link has some detail on this:

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

When you refer to historical bars understanding this link becomes important:

http://www.ninjatrader-support.com/vb/showthread.php?t=3170

[mrlogik]

hey tex,

A quick look. I think closeOpen needs to be a DataSeries. So you would want to do this.

Define the dataseries in the variables area

private DataSeries sOpenClose;

Then in the initialize method

sOpenClose = new DataSeries(this);

Then you can use what you have in this manner.

if(CurrentBar <= barLookBack)
return;

sOpenClose.Set(Close[1] - Open[1]);
double sdev = StdDev(sOpenClose, barLookBack)[0];
Plot0.Set(sdev);

I'm not sure how Close - Open will react; You may have to play with this.

hope this helps.

[texasnomad]

Thanks everyone. At least I was right about it being a newbie error

[texasnomad]

Hello,


closeOpen needs to be a DataSeries. To understand how to set up a data series please visit this link:

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

StdDev() needs a DataSeries as the first argument. This link has some detail on this:

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

When you refer to historical bars understanding this link becomes important:
http://www.ninjatrader-support.com/v...ead.php?t=3170

Ben,

This is my new code. I'm still getting "best overloaded match" errors. I declared closeOpen and sdev as DataSeries. Everything compiles fine except for
"if ( CurrentBar >= barLookBack ) sdev.Set(StdDev(closeOpen, barLookBack)) ;"

[FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]protected [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]override [/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]void[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2] OnBarUpdate()[/SIZE][/FONT]
[SIZE=2][FONT=Courier New]{[/FONT][/SIZE]
[SIZE=2][FONT=Courier New]  closeOpen.Set(Close[[/FONT][/SIZE][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080]0[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2]] - Open[[/SIZE][/FONT][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080]0[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2]]) ;[/SIZE][/FONT]
[/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]  if[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2] ( CurrentBar >= barLookBack ) sdev.Set(StdDev(closeOpen, barLookBack)) ;[/SIZE][/FONT]
[SIZE=2][FONT=Courier New]  Plot0.Set(sdev[[/FONT][/SIZE][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080][FONT=Courier New][SIZE=2][COLOR=#800080]0[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2]]);[/SIZE][/FONT]
[SIZE=2][FONT=Courier New]}[/FONT][/SIZE]
[/SIZE][/FONT]

[NinjaTrader_Ben]

Hello,


Did you do the portions of our instructions that needed to be done in the Variables and Initialization sections? You will see examples of it in my post below and mylogik's post below.

[mrlogik]

sdev.Set(StdDev(closeOpen, barLookBack)[0]);

[NinjaTrader_Ben]

Hello,

Good catch mrlogik! Thanks.

[texasnomad]

That resolved it.. many thanks.

I'm very impressed with this forum. The response time is far better than tradestation.