From: Sam Halliday <sam.halliday@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: calc-eval and lsh/logand of large numbers
Date: Tue, 28 Oct 2014 02:34:12 -0700 (PDT) [thread overview]
Message-ID: <3dfc548c-5076-47e8-841c-1b394129a83a@googlegroups.com> (raw)
In-Reply-To: <bcee5025-f781-4fb6-9ede-9c47c6ae76e4@googlegroups.com>
On Monday, 27 October 2014 22:58:39 UTC, Sam Halliday wrote:
> (require 'calc)
> (defmath bitIndex (i)
> (lsh 1 i))
>
> (calc-eval "bitIndex(64)") ; "0"
>
> I would have expected this to return "18446744073709551616".
I got it. The default word length is 32 bits and needs to be specified explicitly for left-shift.
http://www.gnu.org/software/emacs/manual/html_node/calc/Binary-Functions.html
(defmath bitIndex (i)
(lsh 1 i (+ 1 i)))
prev parent reply other threads:[~2014-10-28 9:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 22:58 calc-eval and lsh/logand of large numbers Sam Halliday
2014-10-28 9:34 ` Sam Halliday [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3dfc548c-5076-47e8-841c-1b394129a83a@googlegroups.com \
--to=sam.halliday@gmail.com \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).