BarsAgo of MIN output

[b16_aln]

I used the MIN method to find the double value between two points. How can I get a reference to the bar of that MIN price? I thought of using LowestBar but I can;t see how I can set it to find the lowest bar within a range.

Thanks

[NinjaTrader_Jesse]

Hello b16_aln,

Are you specifically using a BarsAgo greater than 0 with the MIN method? If not, you can use LowestBar interchangeably:

if(CurrentBar < 20) return;
double value = MIN(Low, 20)[0];
int lowestBar = LowestBar(Low, 20);
double lowestPrice = Low[lowestBar];        
Print(value + " " +lowestPrice + " BarsAgo: " + lowestBar);

If you are using the BarsAgo with MIN as Greater than 0, you would likely need to use a loop instead of MIN or Lowest bar so you can specify the start/end points yourself.

I look forward to being of further assistance.

[b16_aln]

yes i used a lopp to find MIN as i'm looking for the value between 2 points. With MIN I could do it because i could set the start bar for the look back period using [square brackets] but I'm not sure how I can set the start Bar for the lkookback period on the LowestBar function?

[NinjaTrader_Jesse]

Hello b16_aln,

it sounds like you should likely just use the loop you have and some conditions to find the MIN and then use the loops index from that point.

Using LowestBar wouldn't work in your use case because it expects not to be used in a loop in normal bar processing.
Using MIN would be one way to get the MIN however that is also not generally used in a loop but is used with the current bar processing. You can use a BarsAgo with this but for the described use case that is not likely the best way.

Because you already made a loop you can skip using MIN or LowestBar and just calculate the minimum yourself based on the prices seen in your loop. Once you find the minimum price, you could store the loops index at that point.

If you then needed to convert the index to a BarsAgo, that would use the CurrentBar: CurrentBar - foundIndex = BarsAgo

For an example of finding the minimum/maximum in a loop yourself you could see the following page: https://ninjatrader.com/support/help...ghlightsub=min

Assuming your loop is similar you would find the min and once you have also set a variable to the index of that iteration of the loop, going from the help guide sample that might look similar to the following:

double newMin = Math.Min(tmpMin, plotValue);
if(newMin != tmpMin) myIndex = index;
tmpMin = newMin;

You could do this in various different ways, however the concept would generally be the same.


I look forward to being of further assistance.

[b16_aln]

Hi Jesse,

I'm not sure if the link you posted is correct. What would a function that sets the chart scale have to do with this?

I'm really not following what your saying about finding the index of the MIN bar, could you please explain this further.

[NinjaTrader_Jesse]

Hello b16_aln,

I had explained about using the loop from the linked sample because you said you were using a loop. The page I linked this page has an example of a loop being used which makes it a good comparison. That sample also shows finding the min/max in the loop which is also what you are doing, so this sample matches what you want to do.

The concepts from that sample are the same as your requirements:
Finding the minimum
looping over a range of time

Because you didn't provide any sample, it would be up to you to learn from this code and apply it in your own situation. You said you are using a loop, so you could compare your loop with this loop to understand how you can calculate the minimum. I also explained one way you could store the index when the minimum is found and also provided a way to calculate BarsAgo from the index. You can use all of this information to apply toward your loop in your script, you would just need to review the sample further and make comparisons to see where that will fit with your existing loop.

Please let me know if may be of further assistance.

[b16_aln]

Thanks. Can you explain the concept of Index that you refereed to please, I looked at the guides but I can't understand it as there is not much detail there.

[NinjaTrader_Jesse]

Hello b16_aln,

The index would be your loops iterator, that depends on what you programmed as to what that would be called in your code. Most commonly you will see the index represented as "i" or "index" in a for loop. The sample I linked that would be "index".

for ([B]int index [/B]= ChartBars.FromIndex; index <= ChartBars.ToIndex; index++)

This is not specific to NinjaScript but is specific to C# for loops. A for loop iterates a number of times based on the criteria you supply, the iterated variable in the loop in this case is index which gets incremented each loop. For this use case, it represents a bar index because this sample is looping over the bars on the chart. That is very likely similar to what you are describing, or looping over a set of bars where your index would be the incremented loop value.

If you can provide a sample of what you are actually coding that would be much more helpful so we can just talk about what you are doing in your logic. Without knowing specifically what you coded all I can really do is direct you to similar concepts which you can learn from. Because we are using C# and manually coding, you can review the syntax from other samples to understand concepts and then apply them to your code as needed.

I look forward to being of further assistance.

[b16_aln]

Thanks Jesse,

Yes I was aware and using int "i" in loops but never put 2 and 2 together to use index over the NT8 Bar series . I only used it over a <list> up till now.

I'm very new to coding and c# so appreciate the assistance. I will look over it all over the weekend.