Getting value of previous bar

[Ousher]

I have an assigned variable

double marketCount = 0;

The value marketCount gets updated after each bar closes.

I want to access the value of the previous bar's marketCount to compare with the value of the current bar.

How do I access that?

I tried marketCount[1] but I get an error " Cannot apply Indexing with [] to an expression"

Thanks!

[NinjaTrader_Jesse]

Hello Ousher,

You would need to make hat variable into a Series if you wanted to be able to get the previous value using a BarsAgo. You can still use that variable to access the previous value so long as you set the variable after whatever logic uses it.

Here is a simple example:

private double marketCount; 

protected override void OnBarUpdate()
{

    // use the variable first, on each bar this will be the previously set value
   if(marketCount > 0)
   {

   }
    //as the last action set the value to the new value for the current bar. 
    marketCount = Close[0];

    // you can use the current bars value down here if needed

}

If you wanted to use a BarsAgo instead you can create a series<double> https://ninjatrader.com/support/help...ightsub=series