Acessing and plotting previous data

[jt888]

How do I get an indicator to plot data that is 7 days old and in sync with current time of day? As well be able scroll back and view previous days delayed info.
e.g. plot Monday 19, 7:30 data as current day Monday 26, 7:30
I have tried indexing using the following, but will not show previous data:
int index = CurrentBar-(Bars.GetBar(DateTime.Now.AddDays(-7))+1;

[NinjaTrader_PaulH]

Hello jt888,

Thanks for your post and welcome to the forums!

I'm not sure I understand what you are trying to accomplish. Do you have a chart example that you can illustrate with?

[jt888]

Sorry, no chart sample. What I am trying to do is plot an indicator with week old data as if it were current data. Indicator would be showing Tuesday 20/09/16 as if it were Tuesday 27/09/16 on Tuesday 27/09/16 using a 1 minute chart. e.g. MACD indicator data for Tuesday 20th @ 7:00 am would be plotted as if it were Tuesday 27th @ 7:00 am and Tuesday 27th @ 7:00 am being the current time and bar. As well, have previous bars showing week old data for that time and bar.
Tried indexing and plotting indicator, as well as setting Maximum bars look back to infinite but nothing shows up.
int index = CurrentBar-(Bars.GetBar(DateTime.Now.AddDays(-7))+1;
MACD(12,26,9).Diff[index]

[NinjaTrader_PaulH]

Hello jt888,

What I recommend is that you print out, on a bar by bar basis, the value of index and see if it is as you expected. You are using the index as a barsago value for the macd diff series. Are you ensuring that you are not trying to access a barsago value that does not yet exist? (as indicated by errors in the "log" tab of the NinjaTrader control center). Are you also assigning the macd diff series to a plot?

[jt888]

I now have indicator working with previous data at current bar. It will plot MACD (previous week day data) from point of indicator being loaded and forward. All works good from that point. It is processing and plotting correct data just nothing prior to bar in which indicator was loaded. No errors showing up in log. How do I get indicator to plot bars ago data occurring prior to loading? If I put in a value of 20 for bars ago everything works fine. Added code below.





protected override void Initialize()
{
Add(new Plot(Color.Green, "Macd"));
Add(new Plot(Color.DarkViolet, "Avg"));
Add(new Plot(new Pen(Color.Navy, 2), PlotStyle.Bar, "Diff"));

Add(new Line(Color.DarkGray, 0, "Zero line"));

fastEma = new DataSeries(this, MaximumBarsLookBack.Infinite);
slowEma = new DataSeries(this, MaximumBarsLookBack.Infinite);
}

/// <summary>
/// Calculates the indicator value(s) at the current index.
/// </summary>
protected override void OnBarUpdate()
{

if(CurrentBars[0] < BarsRequired)
return;

int index = CurrentBar-Bars.GetBar(DateTime.Now.AddDays(-7))+1;
//int index = 20;
/*
if (CurrentBar == 0)
{
fastEma.Set(Input[0]);
slowEma.Set(Input[0]);
Value.Set(0);
Avg.Set(0);
Diff.Set(0);
}
else
{

*/
fastEma.Set((2.0 / (1 + Fast)) * Input[index] + (1 - (2.0 / (1 + Fast))) * fastEma[1]);
slowEma.Set((2.0 / (1 + Slow)) * Input[index] + (1 - (2.0 / (1 + Slow))) * slowEma[1]);

double macd = fastEma[0] - slowEma[0];
double macdAvg = (2.0 / (1 + Smooth)) * macd + (1 - (2.0 / (1 + Smooth))) * Avg[1];

Value.Set(macd);
Avg.Set(macdAvg);
Diff.Set(macd - macdAvg);
// }
}

[NinjaTrader_PaulH]

Hello jt888,

Thanks for your post.

Please add a screenshot that shows the issue and also attach the source file for review. The source file can be found in Documents>Ninjatrader7>bin>Custom>Indicator> and will have a .CS extension.

To post a screenshot with Windows 7 or newer I would recommend using Window's Snipping Tool.

Click here for instructions

Alternatively to send a screenshot press Alt + PRINT SCREEN to take a screenshot of the selected window. Then go to Start--> Accessories--> Paint, and press CTRL + V to paste the image. Lastly, save as a jpeg file and send the file as an attachment.

Click here for detailed instruction

[jt888]

Indicator was load at 7:25. Starts plotting at close of bar and plots at the close of every bar following. Indicator is plotting MACD bars ago at approximately a week ago. The problem I am having is that nothing is being plotted prior to 7:25. I appreciate the help.
Code and window snap shot attached.
Thank You,
Jim

[NinjaTrader_PaulH]

Hello jt888,

Thanks for your post.

The issue is related to using DateTime.Now and would recommend that you use Time[0] instead. However the trick is going to be to wait until you have 7 days of data loaded before trying to access and plot the data from 7 days ago.

[NinjaTrader_PaulH]

Hello jt888,

Alternatively, if you want to just use a standard MACD you can use the "displacement" feature of the indicator to shift the indicator. In the indicator parameters is the row "Displacement" where you can enter a specific number of bars to shift the indicator.

[jt888]

The Time[0] solved the problem. THANKS.
I will now use it in calculating shift for a standard MACD.