How to assign a value from a previous bar to the current bar

[ballston]

Hi,


This is driving me crazy...... I have a simple calculation running which plots a line based on the max and min value of the last 5 bars.
The calculation looks like this:

Price[0] = ((MAX(High, 5)[0] + MIN(Low, 5[0])) / 2.

This plots just fine and is as I would expect.

But, I want to add another plot which offsets these values by 1 bar. I.e I want the current value of my new plot to be assigned the last previous value of the existing plot.

I have tried this:

Price2[0] = Price[1] but this doesn't work because I assume at the start of time there is no value for Price[1].


How can I get around this? I have tried all sorts to no avail. It's such a simple thing yet I can't work it out.


Thanks.

[NinjaTrader_Jesse]

Hello ballston,

Thank you for the post.

Are you seeing an error? What you provided should work but you are correct, on bar 0 the [1] bars ago will not exist so you would need a condition like:

if(CurrentBar < 1) return;

I look forward to being of further assistance.

[ballston]

Hi,

The compiler doesn't come up with an error, but there are no plots.

The Ninjascript output says: Error on calling 'OnBarUpdate' method on bar 1: Index was outside the bounds of the array.


How do I use what you have said in context?

Would it be:

Price[0] = ((MAX(High, 5)[0] + MIN(Low, 5[0])) / 2

if(CurrentBar < 1) return;
Price2[0] = Price[1];


Thanks.

[ballston]

Hi again,


I got it working thank you. I knew it was simple!
Thanks for your help.

Rds,
Ben

[NinjaTrader_Jesse]

Hello ballston,

Yes that would be correct, the line following the current bar check would not happen on bar 0 but would happen on bar 1 once a plot value had been set.

I look forward to being of further assistance.