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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 14:03:49 -0700 |
Yo Fred!
On Fri, 22 Jul 2016 13:55:52 -0700 (PDT)
Fred Wright <address@hidden> wrote:
> On Fri, 22 Jul 2016, Gary E. Miller wrote:
>
> > My main attack for a while will we be in geting the numeric
> > precision solid. Calculating things to about 11 significant
> > decimal digits is harder than it looks. A 64 bit long is only
> > about 10 decimal digits.
>
> Umm, a *64-bit* long is about 19 decimal digits. Though a double is
> only good for about 15.
And I can't see how to force Python to use a 64-bit long. Got a clue
for me?
15 from a double is probably close enough, but I would go long double
if I could figure out to get Python to do that.
Do I need to go to NumPy, or something, to force precision in Python?
> > For example, my longitude is 121.314064921W, but a long can only
> > hold 2147483647.
>
> Then it must be a 32-bit long.
We aim to have gpsd run on 32 bit and 64 bit systems. RasPi's, Odroid's
and BBB's currently are 32 bit only.
BTW, John's mailer mungs my UTF-8...
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
pgpBUc_p3xY1h.pgp
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- Re: [gpsd-dev] âCEP(50) 0.285 metersMime-Version: 1.0, Hal Murray, 2016/07/22
- Re: [gpsd-dev] âCEP(50) 0.285 metersMime-Version: 1.0, Gary E. Miller, 2016/07/22
- Re: [gpsd-dev] âCEP(50) 0.285 metersMime-Version: 1.0, Norton Allen, 2016/07/22
- Re: [gpsd-dev] âCEP(50) 0.285 metersMime-Version: 1.0, Fred Wright, 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, Fred Wright, 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, 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, Fred Wright, 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, Fred Wright, 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, Fred Wright, 2016/07/22
- Re: [gpsd-dev] ✘CEP(50) 0.285 metersMime-Version: 1.0, Gary E. Miller, 2016/07/22