The Museum of HP Calculators

HP Forum Archive 21

 Happy PI Day from EuropeMessage #1 Posted by Raymund Heuvel on 13 Mar 2012, 11:15 p.m. Americas: be patient, arriving soon ....

 Re: Happy PI Day from EuropeMessage #2 Posted by Matt Agajanian on 13 Mar 2012, 11:50 p.m.,in response to message #1 by Raymund Heuvel Okay, I'll admit it. I'm a geek. I get the joke!

 Re: Happy PI Day from EuropeMessage #3 Posted by Gerson W. Barbosa on 13 Mar 2012, 11:50 p.m.,in response to message #1 by Raymund Heuvel Mar/14 already in easternmost South America. Consider the following polynomial equation: ```3*x^34 - 1000000000000*x - 240000000000000000 = 0 ``` Find the positive real root to 9 decimal places. Notice the digits in the coeffients are 0, 1, 2, 3 and 4 (not related to the answer). Edited: 13 Mar 2012, 11:52 p.m.

 Re: Happy PI Day from EuropeMessage #4 Posted by C.Ret on 14 Mar 2012, 5:20 a.m.,in response to message #3 by Gerson W. Barbosa Hi, Ah! The difficult task was to count all the zeroes! lol I have to print it and remake it twice to be OK! I perhaps need to call my ophthalmologist for a visit. To the attention of those who have, like me, a hard time counting the zeroes on their ten fingers: 3.x34 - x.1012 - 240×1015 = 0 A positive solution is a good 9-decimals approximation for a PI day ! Edited: 14 Mar 2012, 5:24 a.m.

 Re: Happy PI Day from EuropeMessage #5 Posted by Valentin Albillo on 14 Mar 2012, 7:27 a.m.,in response to message #3 by Gerson W. Barbosa Hi, Gerson: Very nice. This is my very own contribution which I serendipitously discovered some 3.14 decades ago: The simple expression: evaluates to Pi correct to nearly 10 digits. Best regards from V. ``` ```

 Re: Happy PI Day from EuropeMessage #6 Posted by Gerson W. Barbosa on 14 Mar 2012, 8:04 a.m.,in response to message #5 by Valentin Albillo Hi Valentin, 3.14 decades ago I had only half a dozen digits: ```sqrt((tan(arctan(0.7) + 2*arctan(0.07)))^2 + 3^2) ``` I had no calculator then, but I had a 7-decimal logarithm table :-) Best regards, Gerson.

 Re: Happy PI Day from EuropeMessage #7 Posted by Glenn Becker on 14 Mar 2012, 5:05 a.m.,in response to message #1 by Raymund Heuvel My pi t-shirt (first 5000 digits) is all ready! =]

 Re: Happy PI Day from EuropeMessage #8 Posted by John B. Smitherman on 14 Mar 2012, 7:21 a.m.,in response to message #1 by Raymund Heuvel Thanks Raymund. I actually celebrated Pi at 7:22 pm last night. Is that close enough? ;-) I recently watched the movie Pi which was released in 1998: Regards, John

 Re: Happy PI Day from EuropeMessage #9 Posted by Dominic Richens on 14 Mar 2012, 7:38 a.m.,in response to message #1 by Raymund Heuvel I'm boycotting Pi day - Pi is just plain wrong. See you on June 28th! (which also happens to be my half-birthday...I think that might be slightly ironic)

 Re: Happy PI Day from EuropeMessage #10 Posted by Gerson W. Barbosa on 14 Mar 2012, 8:10 a.m.,in response to message #9 by Dominic Richens 22/07 is a slightly more accurate Pi Day (which also happens to be my birthday :-)

 Re: Happy PI Day from EuropeMessage #11 Posted by Jean-Michel on 14 Mar 2012, 8:32 a.m.,in response to message #9 by Dominic Richens Hello, I'm also boycotting this so called Pi day, but for another reason. I find the American date format absolutely not convenient and prefer by far the Europen one (day/month/year). I find strange to begin the date with the data that changes in the lowest way (year), and not by the one which changes in the fastest way (day). Do other people here share my point of view? Hence, no Pi day for me... That said, year/month/day format is convenient for ordering of files named this way '2012-03-14_file_name". Anyway, enjoy your Pi day! Kind regards.

 Re: Happy PI Day from EuropeMessage #12 Posted by Walter B on 14 Mar 2012, 9:00 a.m.,in response to message #11 by Jean-Michel Bonjour Jean-Michel, I share your view that Y-M-D is nice for keeping your files properly sorted. Just FYI, Y-M-D is the Chinese date format. The US-American is a bit distorted with M/D/Y - forth and back again. Cf. pp. 29 and 35 of "the manual" ;-) The drawback of the European format is we can't have a PI day, however.

 Re: Happy PI Day from EuropeMessage #13 Posted by Jim Yohe on 14 Mar 2012, 1:12 p.m.,in response to message #12 by Walter B I've been using the Y-M-D format in everything (filenames, dated documents, signed papers, etc.) for about 12 years now. I didn't realize beforehand how easy it was to sort files so I've used it anywhere I wasn't forced back into the M/D/Y format that, for example, IRS still uses. Still, without the M/D/Y we'd be without Pi days. FYI, in two more years (should we make it past the cataclysmic event purported to happen this year on December 21th - Mayan calendar reference) we'll have a Pi day using both the M-D and M-(2 digit)Y formats. ;-) Happy Pi Day!

 Re: Happy PI Day from EuropeMessage #14 Posted by Jim Yohe on 14 Mar 2012, 6:18 p.m.,in response to message #13 by Jim Yohe I suppose that would be Pi day and Pi year ...

 Re: Happy PI Day from EuropeMessage #15 Posted by Lode on 14 Mar 2012, 3:35 p.m.,in response to message #12 by Walter B Personally, I use DMY in normal daily usage (being European). But I use YMD quite often on the computer, because dates like 20120314 sort nicely. But I find the American MDY format very confusing because it is neither ordered from smallest to largest, nor from largest to smallest.

 Re: Happy PI Day from EuropeMessage #16 Posted by Jeff O. on 14 Mar 2012, 9:06 a.m.,in response to message #11 by Jean-Michel Feel free to boycott, but then you’ll miss all the fun! Quote: Do other people here share my point of view? Apparently quite a few do: Only magenta in the above exclusively uses the MDY format. Cyan, with population totaling some 3,200,000,000 uses DMY. But yellow, some 1,500,000,000 persons, uses YMD, not sure how they express it if they drop the year. My guess is MD, so that may be the way of the future. I can see the logic of the DMY format, and would not mind that format in the US. But I do not anticipate it changing any time soon, as it is ingrained in our culture. At least using the MDY format is not nearly as harmful as our continued use of the US Customary Units system of weights and measures. The other major difference between the US and the rest of the world (OK, not the only other difference, but perhaps the only one suitable for discussion here) is of course the dot vs. comma for radix character and digit grouping separator. In this case, I believe the US convention is actually more logically consistent. My opinion only, no offense (or offence, if you prefer) intended.

 Re: Happy PI Day from EuropeMessage #17 Posted by Luiz C. Vieira (Brazil) on 14 Mar 2012, 12:17 p.m.,in response to message #16 by Jeff O. Hi, Jeff; I agree with the dot as a radix mark, I prefer it for comma in that matter. It seems more logical to me, too. I have been using YMD reference myself, mostly in directories and when naming some grouped, date-ordered file. If you name dates in YMD, a single number-based sorting will sort dates as well, no need to specific algorithms. Cheers. Luiz (Brazil)

 Re: Happy PI Day from EuropeMessage #18 Posted by Jeff O. on 14 Mar 2012, 8:39 a.m.,in response to message #1 by Raymund Heuvel I was under the impression that today's date is expressed as 14-3 in Europe, and South America, and Asia, and Australia... :-) Regardless of your preferred format for presentation of the date, Pi certainly deserves its own day, of course.

 Re: Happy PI Day from EuropeMessage #19 Posted by Walter B on 14 Mar 2012, 9:05 a.m.,in response to message #18 by Jeff O. Quote: today's date is expressed as 14-3 in Europe, and South America, and Asia, and Australia For Europe, it's 14.3.2012 today. There are different formats in Asia as your map shows :-) Edited: 14 Mar 2012, 12:40 p.m.

 Re: Happy PI Day from EuropeMessage #20 Posted by Lode on 14 Mar 2012, 3:37 p.m.,in response to message #18 by Jeff O. Hmm, 14-3 somehow looks weird. I guess it's more like 14/3.

 Re: Happy PI Day from EuropeMessage #21 Posted by Jeff O. on 14 Mar 2012, 8:47 p.m.,in response to message #20 by Lode In the US, both the dash and forward slash are commonly used, i.e. you wil see both 3-14-2012 and 3/14/2012. The dot (3.14.2012) is not as common.

 Re: Happy PI Day from EuropeMessage #22 Posted by Marcus von Cube, Germany on 15 Mar 2012, 3:12 a.m.,in response to message #21 by Jeff O. In Germany it's just the dot. Period! ;-) In spoken language we follow what's written. When "14" denotes the cardinal number ("vierzehn") then "14." is the ordinal "der Vierzehnte" (14th). When we write down a date such as 14.3.2012 it's pronounced accordingly: "Der Vierzehnte Dritte ZweitausendzwĂ¶lf" which literally translates to "The fourteenth (day of the) third (month of the year) two thousand and twelve".

 Re: Happy PI Day from EuropeMessage #23 Posted by Eddie W. Shore on 14 Mar 2012, 9:19 a.m.,in response to message #1 by Raymund Heuvel Quote: Americas: be patient, arriving soon .... HAPPY PI DAY! My favorite day of the year!

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