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Kevin Ryde on Thu, 29 Jul 2021 01:53:40 +0200
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Re: Is it possible to do interval arithmetic, simulate passing intervals as function arguments, like in Giac?
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: Is it possible to do interval arithmetic, simulate passing intervals as function arguments, like in Giac?
- From: Kevin Ryde <user42_kevin@yahoo.com.au>
- Date: Thu, 29 Jul 2021 09:53:09 +1000
- Delivery-date: Thu, 29 Jul 2021 01:53:40 +0200
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- In-reply-to: <CAL+bK4PvyW=cOa08hvC8xYHLPvyq6NkhZUhwQumX88-xn1xoyA@mail.gmail.com> (Neven Sajko's message of "Wed, 28 Jul 2021 16:56:16 +0000")
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I started a bit of poor-man's interval arithmetic for myself
https://user42.tuxfamily.org/temporary/interval.gp
Believe it works, but the log and exp are not efficient. I only wanted
a few simple operations, and stay in gp for convenience. The kinds of
intervals I've used are a few terms of an alternating series, or a few
good decimal digits or bits so a pair of rationals bracketing an actual
value.