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From: "Nasser M. Abbasi" <nma@12000.org>
Newsgroups: comp.lang.ada
Subject: Re: Any good package for mathematical function in Ada?
Date: Mon, 1 Jun 2020 05:48:54 -0500
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Date: 2020-06-01T05:48:54-05:00
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On 6/1/2020 5:19 AM, Dmitry A. Kazakov wrote:

> The test produces:
> 
> J0(1)= 7.65197686557967E-01
> 

That is good. In Mathematica

N[BesselJ[0, 1], 100]

0.76519768655796655144971752610266322090927428975532524186154754911927\
89122152724401671806000989156340

In Maple

Digits:=100;
                          Digits := 100
evalf(BesselJ(0,1))
0.76519768655796655144971752610266322090927428975532524186154754911927\
89122152724401671806000989156340

Want 1,000 digits? 2,000 digits? all can be done.

I think these systems both link to GMP "GNU Multiple Precision Arithmetic Library"
for this. "There are no practical limits to the precision "
https://en.wikipedia.org/wiki/GNU_Multiple_Precision_Arithmetic_Library

https://www.wolfram.com/legal/third-party-licenses/gmp.html


--Nasser