Re: Serious Assistance with PostgreSQL True Infinite Arbitrary Precision Maths.

[Mladen Gogala <gogala.mladen@xxxxxxxxx>]

The answer for you is Pl/Python3u. It can use numpy, which supports infinite precision arithmetic and converting results to double and back. It can also do linked lists. Depending on your age and your preferences, you might try Pl/Perl. I learned Perl in 1993 and have never stopped loving it. It has several modules for the infinite precision arithmetic. My favorite is Math::BigFloat. As for the linked lists, there is List::DoubleLinked module on CPAN. In other words, all procedural extensions can be used to fulfill your requirements. BTW, one of my employers told me that Perl is verboten and that the company has standardized on Python. So I had to learn it. It's not too bad if you're in that sort of things.

Regards

On 8/17/21 10:49 PM, A Z wrote:

Dear pgsql-general,

I'm after Infinite Precision Integer (ii) or Infinite Precision Rational (ir)

type and function support for PostgreSQL, as an easy installation

for two new native types.  That are available under free

and open source conditions, for public, private and commercial, free

use.

I am aware of the pgmp project.  While I have contacted it and and am

awaiting their response, it is the case that the present state of pgmp

is not enough for my needs.

PostgreSQL does not have a private doubly linked list available,

and so I can't assemble all this for myself, given that I do not

know enough about PostgreSQL extensions and the C language.

What I am after is True Arbitrary Precision Arithmetic, and not High Precision

Arithmetic.  What I seek would be contingent only upon available OS or Hardware

memory.

I need arithmetic and comparison support on Integer and Rational (Decimal type)

numbers.  +, -, *,/,%, ==, !=, <>,>,<, >=, <=. Other important candidates required

include +=, -=, *=, /=, %=.

The trick is, that I also need full classical function support as well.  What I need

fairly well is:

cast(ir) returns double precision;

cast(double precision) returns ir;

cast(ir) returns real;

cast(real) return ir;

cast(ir) returns numeric;

cast(numeric) returns ir;

cast(ir) returns decimal;

cast(decimal) returns ir;

cast(ii) returns bigserial;

cast(bigserial) returns ii;

cast(ii) returns serial;

cast(serial) returns ii;

cast(ii) returns smallserial;

cast(smallserial) returns ii;

cast(ii) returns bigint;

cast(bigint) returns ii;

cast(ii) returns integer;

cast(integer) returns ii;

cast(ii) returns smallint;

cast(smallint) returns ii;

cast(text as ii) returns ii;

cast(text as ir) returns ir;

cast(ir as text) returns text;

cast(ii as text) returns text;

cast(ii as ir) returns ir;

cast(ir as ii) returns ii;

sign(ir input) returns ir;

abs(ir input) returns ir;

pi(ii places) returns ir;

e(ii places) returns ir;

power(ir base, ir exponent) returns ir;

sqrt(ir input) returns ir

nroot(ii theroot, ir input) returns ir;

log10(ir input) returns ir;

loge(ir input) returns ir;

log2(ir input) returns ir;

factorial(ii input) returns ii;

degrees(ir input) returns ir;

radians(ir input) returns it;

sind(ir input) returns ir;

cosd(ir input) returns ir;

tand(ir input) returns ir;

asind(ir input) returns ir;

acosd(ir input) returns ir;

atand(ir input) returns ir;

sinr(ir input) returns ir;

cosr(ir input) returns ir;

tanr(ir input) returns ir;

asinr(ir input) returns ir;

acosr(ir input) returns ir;

atanr(ir input) returns ir;

The last two sets of functions are forward and inverse trigonometry functions,

both in degrees and radians.

I also need the update module to install easily.  A windows *.exe and *.msi,

a Linux *.deb, *.rpm or *.bin. 

Is there someone or something out there that can get there?

-- 
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
https://dbwhisperer.wordpress.com