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Fri, 19 Mar 2021 20:18:14 -0300 (ADT) Received: from [192.168.0.2] ([24.207.90.194]) by Eastlink with ESMTP id NONhlrc2ZxMqjNONilVFGn; Fri, 19 Mar 2021 20:18:14 -0300 X-Authority-Analysis: v=2.4 cv=F5mSyotN c=1 sm=1 tr=0 ts=60553136 a=zv49KfEsxEDzuN5AGO7r0Q==:117 a=zv49KfEsxEDzuN5AGO7r0Q==:17 a=IkcTkHD0fZMA:10 a=gq-8dz0IddAMDJOpdb4A:9 a=VtXo3p8cUhFS2Y7m:21 a=vSWCZJU81Q5LEXKN:21 a=QEXdDO2ut3YA:10 X-Vade-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrudefledgfeekucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecugfetuffvnffkpffmpdfqfgfvnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefvhffukffffgggtgfgsehtkeertddtfeejnecuhfhrohhmpeftrgihucetnhgurhgvfihsuceorhgrhigrnhgurhgvfihssegvrghsthhlihhnkhdrtggrqeenucggtffrrghtthgvrhhnpeetvefgtdfgueegveduhfelffegteegheeugfegveehkeeftdehjedugedutddtheenucfkphepvdegrddvtdejrdeltddrudelgeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpedvgedrvddtjedrledtrdduleegpdhhvghloheplgduledvrdduieekrddtrddvngdpmhgrihhlfhhrohhmpehrrgihrghnughrvgifshesvggrshhtlhhinhhkrdgtrgdprhgtphhtthhopeiishhhqdhushgvrhhsseiishhhrdhorhhgpdhgvghtqdgkihhprfgrshhsfigupehtrhhuvg X-Vade-Score: -100 X-Vade-State: 0 X-EL-IP-NOAUTH: 24.207.90.194 To: Zsh Users From: Ray Andrews Subject: run time of math problem Message-id: Date: Fri, 19 Mar 2021 16:18:13 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-version: 1.0 Content-type: text/plain; charset=utf-8; format=flowed Content-transfer-encoding: 8bit Content-language: en-US X-Seq: 26582 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: This question might not even be answerable and it's only a point of interest: I was working out some probabilities and the algorithm looks like this: for ((level=1; level<100; level++)); do     sum=     remainder=$(( (level - 1.0) / level ))     for ((terms=level; terms; terms--)); do         sum+=$(( remainder**(terms - 1) ))     done     divided=$(( sum * (1.0 / level) ))     echo for level: $level, survival: $divided done Now if I avoid the 'remainder' variable:     for ((level=1; level<100; level++)); do         sum=         for ((terms=level; terms; terms--)); do         # 'remainder' calculation done directly here:         sum+=$(( ( (level - 1.0) / level )**(terms - 1) ))     done     divided=$(( sum * (1.0 / level) ))     echo for level: $level, survival: $divided done ... I'd expect the thing to run a teeny bit faster but in fact it runs about 15% slower.  Is that explicable?  Does zsh prefer calculations done in steps with variables for each step?  Or is this just some little anomaly?  Things might not optimize every time.