Check for NBarsUp Event in the last 7 bars

[Lonneman]

Hi,

how can I monitor if there was an NBarsUp Event during the last 7 bars?

I tried this, but it doesn't work:

for (int i = 0; i < 7; i++)
{
double value = NBarsUp(3, true, true, true)[i];

if (value == 1)
{
BackColor = Color.Green;
}
}

P.S.: Interestingly, if I change it to "for (int i = 0; i > -7; i--)", it gives a green background for the 7 bars leading up to the NBarsUp Event. So, looking into the future works, but the ordinary use doesn't? What am I missing?

[NinjaTrader_Bertrand]

Any log errors you would see as the indicator refuses to work for you?

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

[Lonneman]

I'm using it on a chart with plenty of historical data. The NBarsUp indicator works - have a look at the picture I attached.

Let me try to explain it simpler:

This (as expected) produces a green background for the bar with the green NBarsUp indicator:

if (NBarsUp(3, true, true, true)[0] == 1)
BackColor = Color.Green;

If I change the [int bars ago] from [0] to [-1] (thus looking into the future, I guess), it produces a green background one bar to the left of the green NBarsUp indicator.

If I change the [int bars ago] from [0] to [1], I expect it to produce a green background one bar to the right of the green NBarsUp indicator. Instead, I get no green background at all (as seen in the attached picture).

This last case is the problem I don't understand.

I don't know about log errors. How do I check that?

Of course, I am also open to a different solution to check for an NBarsUp event during the last 7 bars.

[NinjaTrader_Bertrand]

The issue is not historical data loaded, but accessing a non available historical data series point at the start of the chart, hence you need the check at the start of the OnBarUpdate() as outlined in the tip link I posted - the log errors can be checked in the right most tab of the Control Center.

[Lonneman]

Now I see what you mean - important lesson.

Thank you - problem solved.