Curious 399.9999999999

[gg80108]

I'm calling two values from the stock Darvis Indicator.. Not sure what the "double.MinValue" is about....
public class Darvis : Indicator
{
#region Variables
public double boxTop = double.MinValue;
public double boxBottom = double.MaxValue;
--------------------------------------------------------------------------------------------------------------------------------
The values seem to DrawText on my chart ok but when I try to display in the Output Window there is a curious 399.99999999 that seems to be appended to the value..

My Strategy
private double DarvisTBox = double.MinValue;
private double DarvisBBox = double.MaxValue;

DarvisTBox = DarvisIndicator().boxTop;
DarvisBBox = DarvisIndicator().boxBottom;
DrawText("MyText"+ CurrentBar, DarvisTBox.ToString(), 0, DarvisTBox, Color.Blue);
DrawText("MyText2"+ CurrentBar, DarvisBBox.ToString(), 0, DarvisBBox , Color.Red);

Print(Time[0]);
//Print( DarvisBBox);
Print(DarvisIndicator().boxBottom);

Output window
339.999999999989
8/3/2010 10:44:33 AM
762
339.999999999989
8/3/2010 10:46:06 AM
762
339.999999999989
8/3/2010 10:46:40 AM
762
339.999999999989
8/3/2010 10:47:35 AM
1.79769313486232E+308 (looks like this shows up when there is no value)
339.999999999989
8/3/2010 10:48:25 AM
1.79769313486232E+308

[NinjaTrader_RyanM1]

Hello gg80108,

This most likely relates to double precision issue. Below is wikipedia article on this:

http://en.wikipedia.org/wiki/Double_precision

It's sometimes difficult to store the precise number in a double value. Some approaches for working on this issue are covered in this post:

http://www.ninjatrader.com/support/forum/showthread.php?t=3929

[gg80108]

Txs the Math.Abs did the trick!