From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 27135 invoked from network); 13 Mar 2022 04:45:51 -0000 Received: from minnie.tuhs.org (45.79.103.53) by inbox.vuxu.org with ESMTPUTF8; 13 Mar 2022 04:45:51 -0000 Received: by minnie.tuhs.org (Postfix, from userid 112) id 692EA9CEEA; Sun, 13 Mar 2022 14:45:47 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 91E109C772; Sun, 13 Mar 2022 14:44:03 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="a95/AqfT"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 879659C772; Sun, 13 Mar 2022 14:43:59 +1000 (AEST) Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) by minnie.tuhs.org (Postfix) with ESMTPS id 2E2BB9C73E for ; Sun, 13 Mar 2022 14:43:55 +1000 (AEST) Received: by mail-pj1-f52.google.com with SMTP id v4so11614316pjh.2 for ; Sat, 12 Mar 2022 20:43:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:content-transfer-encoding:mime-version:subject:date:references :to:in-reply-to:message-id; bh=/HP6cHOMj+HlXiAAQb4cRYg4zJckfQyF+phltuMDxx4=; b=a95/AqfTGQ59d3U96zwxkdreWQy4jpR3FIoR8RZMSGzLuSbrAojQFv3f+HG+ZN2Y3Q lQOrChQm0zHBQOjaQchqcZp9v5Rp1xVKIR2oEmZYpCT9OzRYuQE+TpgSY0nU3cI5BwsB Ej91SPn34lmbKCdz/e99QEopvon+c5aI/Zzgoh3F5BbKZtQF2rVYoNtgv1N4UMexyF9T GsNlOtQuxvfwfTOyFUvh7CvCnWUxAYcKs4oK8UH092/mi3qSsnhxhjVG/r+dNryrj2/O sI+xWsV9YvDpSMGIhbsbZ/d1J+VJCplGI3wlXgHm01pSia7TYHDQzo/PWxfPrSU6zrOm zaFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:date:references:to:in-reply-to:message-id; bh=/HP6cHOMj+HlXiAAQb4cRYg4zJckfQyF+phltuMDxx4=; b=kXge2JDdJS+idrqDphnbrko/I3CJnavygeANOcp3WD9MQCfNWJiJz8HKzZRpK4ndYU slp86w3Vg0uYLmiH7g9SSl/2DBIFOXFIxQppTHWbfEps4W/GUD7aIFT/yraXbrDYJYzc 24P0AAso/FusYfH05uMkNRSX0gt1HMRDWXr+Fsec6sTxvP+FajfP9Y4vBH+Fc6QBx3Fa 6jXmoYdWAL5xnpmi1KvzQyUfaE9Is0loGWY13IVvSQghs5Jg7t1LjilkSl2ppE+eBPU/ U1vns9xMrqioRQOzSbb9uZ6TEB/3KRbioT7RXcnj7BUQcaTpeqXdHERcbB+TKmGkXLp3 sjnA== X-Gm-Message-State: AOAM533GxKgPlMpkGOz8GmNMFP+/NdxgpNAdFkDvhqFTsOeU8kj2vB1s 1rTBWtgCZft6nzUNqxri4GQ= X-Google-Smtp-Source: ABdhPJznopOwPfP+JS5CrMiilI6tUkEgFiECG9nUYzsEoOAVDgm/MRumn7b54eIj22l8wh4X3BOibA== X-Received: by 2002:a17:902:6b8b:b0:14d:66c4:f704 with SMTP id p11-20020a1709026b8b00b0014d66c4f704mr18011906plk.53.1647146634404; Sat, 12 Mar 2022 20:43:54 -0800 (PST) Received: from smtpclient.apple (ip70-162-189-25.ph.ph.cox.net. [70.162.189.25]) by smtp.gmail.com with ESMTPSA id p7-20020a056a000b4700b004f768bbe397sm13405458pfo.99.2022.03.12.20.43.53 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 12 Mar 2022 20:43:53 -0800 (PST) From: Adam Thornton Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) Date: Sat, 12 Mar 2022 21:43:51 -0700 References: <458c38a5-584e-4280-b239-87ec9fc2d933n@googlegroups.com> <223b2bdf-d9fe-2665-1928-fcacfbf0df44@softjar.se> <59d64292-27a9-40d1-a4b5-47851cf47557n@googlegroups.com> <412e00f8-0b2b-4637-838a-5bee04a247b3n@googlegroups.com> <90526a51-cbaf-4179-bbb4-f3d031d68519n@googlegroups.com> <6ae062ff-ca71-4f1e-9acb-dcf909f6f52en@googlegroups.com> <6eda2dc2-9138-4dbc-8490-09c5c2f648f4n@googlegroups.com> To: Rob Pike , The Eunuchs Hysterical Society In-Reply-To: Message-Id: <79BCFAD2-EFAD-4DAA-90F0-DED7699D61FA@gmail.com> X-Mailer: Apple Mail (2.3693.60.0.1.1) Subject: Re: [TUHS] [PiDP-11] Fun with Fortran on the PiDP-11 X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" > On Mar 12, 2022, at 2:02 PM, Rob Pike wrote: >=20 > Indeed. Be careful about the code Numerical Recipes if you are doing > important numerical work.=20 > For simple stuff it's fine, of course, but floating point is a > minefield that requires expert navigation. >=20 > -rob That's the seductive trap of floating-point numbers, isn't it? They = invite us to think about them as if they were the real numbers, but they = are very, very much *not* the real numbers. And yet, most of the time, = for most applications, if you treat them as if they were, you get = plausible results. Adam=