Error defining resistances and supports

[juanram]

I was trying to retrieve custom resistances and supports from a chart with this code:

int range=200;
for(int i=0; i<range; i++){
if(SMA(1)[i]>techo){ //calculo techo con RANGO=X
techo=SMA(1)[i];
}
if(SMA(1)[i]<suelo){ //calculo suelo con RANGO=X
suelo=SMA(1)[i];
}
}

I'm gettint this error: Error al llamar ' OnBarUpdate' método en barra 0: Está accediendo a un índice con un valor que es inválido ya que es fuera de rango, It says that I'm trying to access an index out of range.

My thinking was iterating a few bars before and store the max an min value. I don't know if there's a function that already does that, I didn't see anything in the documentation, if not how can i get rid off this error? Why is there a restriction in range when in the chart I have plenty off bars to get info from?

[NinjaTrader_PaulH]

Hello juanram,

Thanks for your post and welcome to the Ninjatrader forums!

The error message is advising that your script is trying to access a barsago that does not exist at the time that your code started processing the historical data. The script will start on the first bar of historical data and according to your code will try to access up to 200 bars before that which would not exist. You will need to delay processing your code until you have 200 bars sequenced by the script. You can use the system bar counter CurrentBar as a way to check how many bars your script has processed and "return" if less than 200 and then process your code when it is greater than 200.

Please see the example in the help guide here: https://ninjatrader.com/support/help...currentbar.htm

[juanram]

So if I'm understanding it correctly, in the image below, when the script starts running at the bar highlighted in red, from there to the right would be the new bars that were proccessed as they come? How could I acces the bars that are on the left side but were previous from the start of the script?

[NinjaTrader_PaulH]

Hello juanram,

Thanks for your reply.

The script will processing on the very first bar in the data series of the chart. If the chart is loading 5 days of data, then the script will start on the first bar 5 days ago and will process each historical bar in sequence up to the live edge of the chart. This is why you would need to have your script not process the first 200 bars as you are looking back 200 bars when your script is allow to run.