Type Error: n8MA.getValue(-1) ???

[prawles]

Can anyone tell me why I get a type error on this ... plotted on a 233tick charts with 24 hour data ok but not on other charts


var n8MA = offsetSeries( ema(8, sym("ES #F,5")), 0);
var n8MAPlot = n8MA.getValue(-1).toFixed(2);


Thanks Very Much

[ACM]

Re: Type Error: n8MA.getValue(-1) ???

Patrick
What exactly is the error message?
Alex

Originally posted by prawles
Can anyone tell me why I get a type error on this ... plotted on a 233tick charts with 24 hour data ok but not on other charts


var n8MA = offsetSeries( ema(8, sym("ES #F,5")), 0);
var n8MAPlot = n8MA.getValue(-1).toFixed(2);


Thanks Very Much

[prawles]

TypeError: n8MA.getValue(-1) has no properties

[ACM]

Patrick
You need to run a null check on the value of n8MA prior to modifying its properties eg
if(n8MA.getValue(-1)==null) return;
Alex

Originally posted by prawles
TypeError: n8MA.getValue(-1) has no properties

[prawles]

Sure I can check for failure ... but was wondering why it failed ??

[prawles]

var n50DMA = offsetSeries( sma(50, sym("SP #F,D")), 0);
var n50DMAPlot = n50DMA.getValue(-1).toFixed(2);
var n20DMA = offsetSeries( sma(20, sym("SP #F,D")), 0);
var n20DMAPlot = n20DMA.getValue(-1).toFixed(2);

Everything else is ok but not this......

var n8MA = offsetSeries( ema(8, sym("ES #F,5")), 0);
var n8MAPlot = n8MA.getValue(-1).toFixed(2);

[prawles]

So if I check for failure .. and return ... and it always fails ... it will never plot ... so whats the point of that

[gspiker]

So did you try to check for a null return and it continued to happen, or is this only a general question?

In eSignal a built-in study (such as an MA) that requires a specific number of bars before it can start returning valid results will return a null instead of a value until the data set is primed.

Therefore you will get errors similar to what you posted when you try to modify the return value...

[prawles]

Seems it only returns a null

[gspiker]

Post up a small example of a complete EFS that shows this problem...I'm sure someone will look it over (I will if nobody beats me to it)....

[prawles]

Here is an example

[gspiker]

So, I don't have the full contract in my subscription, so when I first ran your EFS I got the exact same message (daily items seemed to work fine, sub-daily interval failed).

I then changed it all to be "ES" instead of "SP" and then changed the code so that all of the code checked for NULL return after getvalue() and grouped the related code together:


var n8MA = offsetSeries( ema(8, sym("ES #F,5")), 0);
var n8MAPlot = n8MA.getValue(-1);

if (n8MAPlot != null) {
n8MAPlot = n8MAPlot.toFixed(2);
drawxxx (-8, n8MAPlot.....)

}

etc...

and it worked just fine.

So unless this is related to the symbol SP directly somehow (which is why I asked about your subscriptions), I'm not sure why it doesn't display for you when you do a null check.

Garth