How to HOLD a value in "OnBarUpdate"..

[Randwulf]

I have a dot plot on the upper line of a Donchian Channel when it slopes down.
I need it to maintain the plot level until it slopes down again.

protected override void OnBarUpdate()
{
Value.Set((MAX(High, Period)[0] + MIN(Low, Period)[0]) / 2);
Upper.Set(MAX(High, Period)[0]);
Lower.Set(MIN(Low, Period)[0]);

if((MAX(High, Period)[0]) > (MAX(High, Period)[-1]))
{
Dip.Set(MAX(High, Period)[-1]);
}
else
{
** Not sure what needs to go here to maintain last value ???
It simply doesn't plot anything if the above "IF" statement is not utilized.
{
}

Thx in advance for any guidance...

[NinjaTrader_Jesse]

Hello Randwulf,

Thank you for the post.

One problem I can see is that you are using Negative BarsAgo, the BarsAgo system works with Positive numbers. You should change the [-1] to [1] if you meant 1 BarsAgo or the previous bar.

To retain the value you could likely use the prior plot value for this purpose:

Dip[0] = Dip[1];

You would also need to check that you have at least 1 bar before doing a BarsAgo check of 1 bar:

if(CurrentBar < 1) 
{
Dip[0] = some value for the first bar;
} else {
 // logic you have shown in the sample 
}

I look forward to being of further assistance.

[Randwulf]

Thank you for the timely reply Jesse.
I knew it should be positive numbers for "bars back" but couldn't seem to get it to work.
I will continue to correct this.
In the meantime, I simply created a "double" variable and assign the change to it and on each bar update it assigns the plot value to it.
Great idea about insuring I have at least 1+ bars first... It's been a long time since I've dabbled in NinjaScript and had forgotten that.
Thanks again for your ever appreciated support...