Re: [Flightgear-devel] Autopilot tuning

[Curtis O. <cur...@gm...>]

Nasal is like C, C++, perl, and php in many ways so if you can read any of
those, you should be pretty confident that what you think nasal is doing is
what it's actually doing.  Writing nasal code from scratch is harder of
course because it requires knowledge of all the picky language syntax
details.

Curt.


On Thu, Jan 28, 2010 at 2:21 PM, Jari Häkkinen wrote:

> I can't read Nasal so I can't say if the function below is correct. For
> what it is worth: A frequency between 108.100 and 111.950 (including end
> points) is a localizer frequency if the first decimal is an odd number.
>
>
> Jari
>
>
> On 2010-01-28 04.45, Ron Jensen wrote:
> > On Wed, 2010-01-27 at 09:06 +0000, Pete Morgan wrote:
> >> I just noticed the info below about localiser on the "Flight Simulation
> >> Naviagtion" site
> >> http://www.navfltsm.addr.com/
> >>
> >> Is there an easy way to determine is the NAV is a Lcoaliser, I cant see
> >> that in Prop tree.
> >>
> >> pete
> >
> > Localizers are found on a few of the NAV frequencies:
> >
> > http://en.wikipedia.org/wiki/Instrument_landing_system#Frequency_list
> >
> > Here is a nasal function to determine if a frequency is a localizer.  It
> > accepts a frequency in megahertz and returns "1" if the frequency is an
> > ILS frequency.
> >
> >
> > var isILS=func(freq) {
> >    if(freq<  108.10) return 0;
> >    if(freq>  111.95) return 0;
> >    var bar=int((freq+0.001)*10)-int(freq)*10;
> >    return(bits.test(bar,0));
> > }
> >
> >
> >
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-- 
Curtis Olson: http://baron.flightgear.org/~curt/