Improper use of Value.Set for ratio indicator

[Chris001]

I am trying to use the code below to produce a Relative Volume (with VOLMA) indicator. When I try and display this on the chart it is blank. What am I doing wrong?


protected override void OnBarUpdate()
{

Value.Set(VOLMA(FastPeriod)[0] / VOLMA(SlowPeriod)[fastPeriod]);

}

[koganam]

I am trying to use the code below to produce a Relative Volume (with VOLMA) indicator. When I try and display this on the chart it is blank. What am I doing wrong?


protected override void OnBarUpdate()
{

Value.Set(VOLMA(FastPeriod)[0] / VOLMA(SlowPeriod)[fastPeriod]);

}

What is the error in your log?

[Chris001]

there isn't one

[Chris001]

Plot0.Set(VOLMA(slowPeriod)[fastPeriod])

will display a blank plot like the code from my original post:

Value.Set(VOLMA(fastPeriod)[0] / VOLMA(slowPeriod)[fastPeriod])

but:

Plot0.Set(VOLMA(slowPeriod)[0])

will display data on the plot

for some reason non zero values for [bars ago] is not working

so I tried:

Value.Set(VOLMA(fastPeriod)[0] / VOLMA(slowPeriod)[0])

and it still will show a blank plot

I'm sure I am missing something quite simple, but this seems so bizarre,

[Chris001]

Another note, I have been thinking about this strategy and I think a look back period might be necessary for the calculation. I think there might be a problem where over the [bars ago] duration [fastPeriod] to [0] the indicator values will be 0 so VOLMA / 0 will create a problem. I am not sure how NT treats this are null values created?

so would something like

Value.Set(VOLMA(fastPeriod)[0] / (VOLMA(slowPeriod)[fastPeriod]) // and somehow include a look back period of fastPeriod for the denominator.

I have attached an image to hopefully help me not sound so confusing. The indicator on the bottom plot was created using the code below. Note [-5] was used since any positive value will not work for this.

Plot0.Set((VOLMA(slowPeriod)[-5]));

[NinjaTrader_Bertrand]

Chris, anything negative would not be supported and not be meaningful, since it would not work like this on the rightmost side / bar of the chart, you cannot plot / use something now you would only have in x bars from now.

You likely miss a check for enough CurrentBars at your OnBarUpdate() start for working with higher index values than 0 - http://www.ninjatrader.com/support/f...ead.php?t=3170

[Chris001]

Thanks Ray. Something is being plotted when I use the code below. I will QC this later and ensure it is calculating what I want, I will post again if there are any problems.

Value.Set((VOLMA(fastPeriod)[0]) / (VOLMA(slowPeriod)[Math.Min(CurrentBar, fastPeriod)]));

[Chris001]

I mean Bertrand, I was referring to the support guy on the link provided.