simon-git: spigot (master): Simon Tatham

[Commits to Tartarus hosted VCS]

TL;DR:
  47f74b8 New number: Catalan's constant.
  14496e5 New functions: sinc, both unnormalised and normalised.
  e7e8a3f Fix a few compile warnings.

Repository:     https://git.tartarus.org/simon/spigot.git
On the web:     https://git.tartarus.org/?p=simon/spigot.git
Branch updated: master
Committer:      Simon Tatham <anakin at pobox.com>
Date:           2018-03-07 20:01:05

commit 47f74b8ec533f64d86fb70c0d230ec79eb3545e1
web diff https://git.tartarus.org/?p=simon/spigot.git;a=commitdiff;h=47f74b8ec533f64d86fb70c0d230ec79eb3545e1;hp=56128fc27e5b0d58982f23d1717f186b22423a1b
Author: Simon Tatham <anakin at pobox.com>
Date:   Wed Mar 7 19:16:21 2018 +0000

    New number: Catalan's constant.
    
    I've been doing loads of spigot work recently, but it's all been NFC -
    refactoring and tidying. It seems a shame not to leave spigot in some
    kind of _user-visibly_ nicer state than it started, so while I've
    still got the enthusiasm to work on it, perhaps I should add an extra
    feature or two.
    
    An email from a user recently mentioned Catalan's constant in the
    context of listing things that other calculating programs supported
    and spigot didn't. I hadn't heard of it before that email, but I
    looked it up, and although Wikipedia gave a fairly painful formula for
    it in the form of a spigotisable series that then has to be added to
    pi*log(2+sqrt(3)), I managed to dig up a paper on arXiv that has a
    much nicer series representation that generates the whole constant all
    by itself.

 consts.cpp              | 115 ++++++++++++++++++++++++++++++++++++++++++++++++
 expr.cpp                |   1 +
 funcs.h                 |   1 +
 manpage.but             |   5 +++
 manual.but              |   5 ++-
 python-doc/api.rst      |   8 ++++
 python-module/testsuite |   1 +
 test.sh                 |   1 +
 8 files changed, 136 insertions(+), 1 deletion(-)

commit 14496e50d06bb373b4420af437af8e167a80a081
web diff https://git.tartarus.org/?p=simon/spigot.git;a=commitdiff;h=14496e50d06bb373b4420af437af8e167a80a081;hp=47f74b8ec533f64d86fb70c0d230ec79eb3545e1
Author: Simon Tatham <anakin at pobox.com>
Date:   Wed Mar 7 19:32:54 2018 +0000

    New functions: sinc, both unnormalised and normalised.
    
    sinc sounded easy before I started (it's just sin(x)/x), and it even
    _looks_ easy now I read over the finished code, but it was
    surprisingly fiddly to get right somewhere in the middle - I needed a
    HoleFiller derivative to fill in the removable singularity at zero
    without causing an exactness hazard, and the normalised version (i.e.
    sin(πx)/(πx)) turned out to be better written as sind(180x)/(πx)
    because otherwise you get further exactness hazards at all the other
    integers.

 expr.cpp                  |  2 ++
 funcs.h                   |  1 +
 manpage.but               |  6 +++++
 manual.but                |  7 +++++
 python-doc/api.rst        |  4 +++
 python-module/__init__.py |  2 ++
 python-module/testsuite   |  2 ++
 test.sh                   | 15 +++++++++++
 trig.cpp                  | 67 +++++++++++++++++++++++++++++++++++++++++++++++
 9 files changed, 106 insertions(+)

commit e7e8a3f429d90b5769440ca7ec8344c52d88f3d8
web diff https://git.tartarus.org/?p=simon/spigot.git;a=commitdiff;h=e7e8a3f429d90b5769440ca7ec8344c52d88f3d8;hp=14496e50d06bb373b4420af437af8e167a80a081
Author: Simon Tatham <anakin at pobox.com>
Date:   Wed Mar 7 19:40:47 2018 +0000

    Fix a few compile warnings.
    
    All benign, I think. The code is now clean under -Wall -Wextra in both
    g++ and clang++, except that clang++ complains endlessly about
    initialisations such as 'matrix = { 1, 0, 0, 1 }' suggesting an extra
    pair of braces, which I think I'd rather not put in if I can avoid it.
    (With -Wno-missing-braces, it's silent.)

 bi_internal.h | 4 ++--
 error.h       | 1 +
 expr.cpp      | 5 ++---
 main.cpp      | 3 +--
 spigot.cpp    | 1 -
 spigot.h      | 7 +++++--
 6 files changed, 11 insertions(+), 10 deletions(-)