Adding a line to current StdDev indicator

[atman]

I am new to NinjaScript. I would like to modify the current StdDev indicator so as to include a line of max value for a period of "lookBackPeriod". I added the following codes under "protected override void OnBarUpdate()" else section:-

if (Value[0] > MAX(maxHigh, lookBackPeriod-1)) {maxHigh[0] = Value[0];}
else {maxHigh[0] = maxHigh[1];}

where Value[0] is the calculated value of current StdDev and maxHigh is a series I added to hold the max StdDev values over a specific period.

However, I got an error as follows:-

Operator '>' cannot be applied to operands of type 'double' and 'NinjaTrader.NinjaScript.Indicators.MAX

Can anyone help? Thankssssssssss.

[NinjaTrader_PaulH]

Hello atman,

Thanks for your post.

It looks like you are missing the bars ago index for the MAX() method.
If you are wanting to use the current bar value then:

if (Value[0] > MAX(maxHigh, lookBackPeriod-1)[0])
{
maxHigh[0] = Value[0];
}
else
{
maxHigh[0] = maxHigh[1];
}

Reference: https://ninjatrader.com/support/help...aximum_max.htm