RE: [GT] New EMA

["Weigert, Thomas" <weigert AT mst.edu>]

SMA uses arg_dependency, not indicator dependency
Zigzag does not have any dependencies, nor does it use
calculate_interval
HilbertPeriod does not use calculate_interval
The old version of ema had all kinds of error messages and did abort.

Basically, if your indicator calls $self->check_dependencies_interval
and it uses indicator dependencies, then it will abort when these
dependencies are not satisfied throughout the interval.

Maybe we can check why there is this difference between arg_dependencies
and indicator_dependencies and maybe adjust the latter. But currently
that is what is happening.... I could try to make the EMA work like SMA
as one need not do the check on the interval (it just uses the
dependencies to compute the SMA for the starting value.

Th.

> -----Original Message-----
> From: Robert A. Schmied [mailto:ras
AT
acm.org]
> Sent: Friday, February 29, 2008 12:41 AM
> To: devel
AT
geniustrader.org
> Subject: Re: [GT] New EMA
> 
> Weigert, Thomas wrote:
> > I think most indicators in GT work like this:
> 
> maybe most, but not all ...
> 
> >
> 
> sma for example has a "calculate_interval", doesn't abort.
> zigzag, the prior version of ema ;-), HilbertPeriod, don't abort
> (ah just because the method is the doesn't mean it's actually
invoked!)
>