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Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0
From: |
Gary E. Miller |
Subject: |
Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0 |
Date: |
Fri, 22 Jul 2016 17:31:10 -0700 |
Yo Hal!
On Fri, 22 Jul 2016 17:10:58 -0700
Hal Murray <address@hidden> wrote:
> address@hidden said:
> > I'd rather do "long double" if I can. Then no worry about improper
> > scaling. And I don't want to rewrite the Python gps.py library in
> > fixed point. Execution speed is not an issue.
>
> I'm not a language geek.
>
> Wikipedia says:
>
> In C and related programming languages, long double refers
> to a floating-point data type that is often more precise than
> double-precision.
>
> Notice the "often" in there.
As previously noted, in C11, it is 'recommended by the standard'.
gcc allows me control over what a long double is. I could solve
the problem in C.
But that is way off in the weeds. The immediate problem is solely
in Python.
> Maybe useful info here:
> http://docs.scipy.org/doc/numpy-dev/user/basics.types.html
>
> There is a float64 but no float128
I hate to pull in another dependency. Unless it directly solves
the problem.
Since the root problem is computing small distances from very close
(lat,lon), do you know a simple libary to do just that?
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
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- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, (continued)
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Gary E. Miller, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Hal Murray, 2016/07/22
- Re: [gpsd-dev] several messages, Fred Wright, 2016/07/22
- Re: [gpsd-dev] several messages, Greg Troxel, 2016/07/23
- Re: [gpsd-dev] CEP(50) 0.285 meters, Fred Wright, 2016/07/23
- Re: [gpsd-dev] CEP(50) 0.285 meters, Fred Wright, 2016/07/23
- Re: [gpsd-dev] ✘CEP(50) 0.285 meters, Gary E. Miller, 2016/07/23
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Greg Troxel, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Gary E. Miller, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Hal Murray, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0,
Gary E. Miller <=
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Greg Troxel, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Gary E. Miller, 2016/07/22