Re: Configurable FP precision (Re: accuracy in calculation)

myh apologies, I got this mixed up with a different mailing list (for some 
reason I thought this was the grbl mailing list which runs on the arduino 
boards), so ignore my comment.

David Lang

  On Sat, 13 Apr 2019, Nikita Zlobin via 
gnuplot-info wrote:

> Date: Sat, 13 Apr 2019 16:54:56 +0500
> From: Nikita Zlobin via gnuplot-info <[email protected]>
> Reply-To: Nikita Zlobin <[email protected]>
> To: [email protected]
> Subject: Re: [Gnuplot-info] Configurable FP precision (Re: accuracy in
>     calculation)
> 
> On Sat, 13 Apr 2019 03:46:28 -0700 (PDT)
> David Lang <[email protected]> wrote:
>
>> unfortunantly the arduino doesn't support double precision floats (if
>> you define something as double, it still uses single)
>>
>> so to get better precision, you would hvae to stop using hardware
>> supported data types and switch to a multi-precision software library
>> or something like that.
>>
>> David Lang
>
> My proposal is not about to force some specific type. It is rather
> about ability to make it configurable. Wether target platform supports
> only single float or more precise choices are supported, it could be
> configured by build system.
>
> But anyway thanks for remark - i really thought, that double is default
> type in gnuplot code. Can't remember is it so - but when i made
> experiment, writing gnuplot plugin, performing calculations with
> libqalculate engine, i needed to look into gnuplot code to understand
> some things.
>
> And by own experience with qalculate - multiple precision stuff is
> really slow. Nearly year ago (as said above, but more) i tried to write
> glue plugin for gnuplot, which allowes to use libqalculate as
> calculation engine, instead of plain glibc/libm. Main workflow with it
> is to preload symbolic expressions into plugin, so that it prepares
> them, then just call them by their ID, with necessary arguments.
> https://github.com/nick87720z/gnuplot-qalc-plugin
>
> The precision is probably overkill, and initially it was created in
> hope to be good addon for qalculate itself, which uses gnuplot for
> plotting, but it rather prepares static data set, then runs gnuplot
> with them - thus gnuplot has adequate interface reaction, but range is
> predefined before rendering and can't be changed without new render.
>
> With current performance i'm not sure it will make it in qalculate
> itself, though might be found useful on some super-pc, dedicated for
> something i would call Bigcalc (workplay after bigdata).
>
>
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