Why CS0021 error?

[Ninat]

Why am I getting an error CS0021 "cannot apply indexing with [] to an expression of type 'double'" on this line of code below?

if (myclose > myclose[1])

Thanks

/////////////////////////////////////////////////////////////////////////////////

protected override void OnBarUpdate()
{

if (CurrentBar < 1)
return;
double myclose = 0;

myclose = Close[0];

if (myclose > myclose[1])
{

Value[0] = myclose;

}
}

[eDanny]

Your myclose is a double variable which can hold only one value. By adding an index [1] you are attempting to look at previous value that is not there. You need to make myclose a data series so there is a previous index value to compare to.

[NinjaTrader_PaulH]

Hello Ninat,

Thanks for your post and welcome to the forums!

The error message is advising that myclose is a double and you have declared it as a double with the statement: double myclose = 0;

A double is a single container, not an array (or data series) so using an index [1] to point to a prior value is invalid.

If all you are doing is storing the current close and want to test the prior close then you can use the close series directly like:

if (Close[0] > Close[1]) // if current close is greater than the previous close
{
Value[0] = Close[0]; // plot the current close
}

If you want to use myclose then you would need to declare it as a double series: http://ninjatrader.com/support/helpG.../?iseriest.htm

[Ninat]

Declaring as series fixed it.
Thank you Danny

//////////////////////////////////////////////////


public class myexample : Indicator
{
private Series<double> myclose;
}