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From: Philipp Stephani <p.stephani2@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Lars Ingebrigtsen <larsi@gnus.org>,
	Emacs developers <emacs-devel@gnu.org>
Subject: Re: master 792ba71: Add a new function 'buffer-line-statistics'
Date: Tue, 12 Jan 2021 19:29:39 +0100	[thread overview]
Message-ID: <CAArVCkSDW5n1VHhJX05Gf3BcgArm3KKqp69fk6EDPO9TRrrV8w@mail.gmail.com> (raw)
In-Reply-To: <jwveeiq2ffk.fsf-monnier+emacs@gnu.org>

Am Di., 12. Jan. 2021 um 19:22 Uhr schrieb Stefan Monnier
<monnier@iro.umontreal.ca>:
>
> > +  double mean = 0;
> [...]
> > +       /* Blame Knuth. */
> > +       mean = mean + (this_line - mean) / lines;
>
> I must admit to not being fully cognizant of Knuth, but doesn't this
> compute the average rather than the mean?
>
> I thought computing the mean was necessarily O(N) in space (like
> keeping the full sequence of line lengths so you can sort it and then
> pick the middle point).
>

That's the median. "Mean" typically means "arithmetic mean."



  reply	other threads:[~2021-01-12 18:29 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210112174748.18372.29339@vcs0.savannah.gnu.org>
     [not found] ` <20210112174750.5928220B2C@vcs0.savannah.gnu.org>
2021-01-12 18:15   ` master 792ba71: Add a new function 'buffer-line-statistics' Stefan Monnier
2021-01-12 18:29     ` Philipp Stephani [this message]
2021-01-12 19:06       ` Stefan Monnier
2021-01-12 18:37     ` Eli Zaretskii
2021-01-12 18:43       ` Eli Zaretskii
2021-01-12 18:39     ` Lars Ingebrigtsen
2021-01-12 19:18       ` Eli Zaretskii
2021-01-12 19:54         ` Stefan Monnier

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