BS: Happy pi day!

Subject: BS: Happy pi day!
From: EBarnacle
Date: 14 Mar 13 - 11:56 AM

It's 3.14 today! Clebrate mathematics.

Subject: RE: BS: Happy pi day!
From: beardedbruce
Date: 14 Mar 13 - 12:00 PM

3.14159265358978...

Subject: RE: BS: Happy pi day!
From: Ebbie
Date: 14 Mar 13 - 12:04 PM

Oh, dear. Surely not. I have to take cookies to Koffee Klatch this morning.

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 14 Mar 13 - 01:21 PM

It's 3.14 today! Clebrate mathematics.
Only in some parts of the world.
It's 14.3 over here!

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 14 Mar 13 - 01:38 PM

Right, this is the Amurrican pi day!

Pi R round!

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 14 Mar 13 - 01:52 PM

It's been pointed out to me that it's actually (drum roll)...

Palindromic Pi Day!

Think about it: 3.14.13

Subject: RE: BS: Happy pi day!
From: EBarnacle
Date: 14 Mar 13 - 03:32 PM

It would appear the Brits have things wardback.

Subject: RE: BS: Happy pi day!
From: GUEST,Stim
Date: 14 Mar 13 - 08:15 PM

And when did this become a holiday?

Subject: RE: BS: Happy pi day!
From: Bill D
Date: 14 Mar 13 - 09:55 PM

So... Brits can never have a pi day? sad....

"Let them eat cake."

Subject: RE: BS: Happy pi day!
From: GUEST,999
Date: 14 Mar 13 - 10:10 PM

Lemme know when you need the next 100,000 . . .

Subject: RE: BS: Happy pi day!
From: JohnInKansas
Date: 14 Mar 13 - 10:53 PM

One report says that the value of π has been calculated to two million (2x10⁶) decimal places.

I'm eagerly awaiting the time when they've finished writing it all down so that I can begin the proofreading on it.

(Of course accurate proofreading requires having a verified accurate copy for comparison to the copy being verified, so it may be a while, since they'll have to write it out at least twice. Some a**hole will probably add another million or so digits before they get even that done.)

John

Subject: RE: BS: Happy pi day!
From: Manitas_at_home
Date: 15 Mar 13 - 04:52 AM

We don't have it backward. Day, Month, Year. Increasing in order of magnitude. You could say that the US has it out of order - not backward and not forward. We tend to say dates as 29th May, 1999 so our notation reflects our speech although it's not considered odd to say May the 29th. But why was George M Cohan born on the 4th of July (British style) and not July the 4th?

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 15 Mar 13 - 05:36 AM

But why was George M Cohan born on the 4th of July (British style) and not July the 4th?
Scansion (5 syllables as against 4)
Rhyme scheme ("Do or die" doesn't rhyme with "July the 4th")
Anyway, would it be said as "July the 4th", or just "July 4th"? (even less syllables!)

Subject: RE: BS: Happy pi day!
From: jonm
Date: 15 Mar 13 - 06:38 AM

Presumably the rest of the world will celebrate pi day on 22nd July.

Subject: RE: BS: Happy pi day!
From: TheSnail
Date: 15 Mar 13 - 06:51 AM

Clebrate mathematics

When is celebrate spelling day?

Subject: RE: BS: Happy pi day!
From: Joe Offer
Date: 15 Mar 13 - 06:59 AM

Alas, pi day got over so quick, I hardly had time to.....pi.

-Joe-

Subject: RE: BS: Happy pi day!
From: GUEST,999
Date: 15 Mar 13 - 09:58 AM

October 17, 2011: The record has been improved to 10 trillion digits.

JiK: you might want to have a look at

http://www.numberworld.org/misc_runs/pi-5t/details.html

I don't understand half what they say on that site nor do I know anything about the other half.

Subject: RE: BS: Happy pi day!
From: EBarnacle
Date: 15 Mar 13 - 10:07 AM

Sorry, Snail. Small keyboard.

Subject: RE: BS: Happy pi day!
From: Donuel
Date: 15 Mar 13 - 10:28 AM

Its Einstein's and my son's birthday.

Subject: RE: BS: Happy pi day!
From: GUEST,999
Date: 15 Mar 13 - 11:55 AM

That means your son is older than you are, Don. I think Einstein would get a chuckle out of that.

Subject: RE: BS: Happy pi day!
From: GUEST,CS
Date: 15 Mar 13 - 12:20 PM

Ah, now I understand! I wondered why the 14th of March had everyone blogging about pi, well actually pies!

Subject: RE: BS: Happy pi day!
From: Bill D
Date: 15 Mar 13 - 01:12 PM

"But why was George M Cohan born on the 4th of July (British style) and not July the 4th?"

That's one of the few dates that just sounds better said that way. "The Twenty-seventh of October" would be a bigger mouthful. We have a tune called "The 8th of January" also, but when you ask someone when they were born, they are 'more' likely over here to say "January", and if asked for the date, it's January the eighth.... so, we write 01/08/1953 or whatever. This way, the leading numbers can be only 1 of 12 and serves to clarify the basic time period immediately, then the specific date follows.

Can one adapt to looking at the middle term to determine the month? Of course. Because of the internet, I have learned to translate in my head when I see what looks like a month beyond 12.

I also have a wonderful calendar program called Calendar Magic which asks for data entry in the m/d/y format, even though I thought the author was in the UK (trying to check on that)

Subject: RE: BS: Happy pi day!
From: JohnInKansas
Date: 15 Mar 13 - 01:17 PM

Many places worldwide have adopted the very sensible practice of writing dates as YEAR-MONTH-DAY for the very practical reason that it's the only way that dumb computers can sort them in chronological order. (It only works really well if the numerical representation for the month is used. although some accounting programs can accomodate standard names/abbreviations.)

Since any "date" entered as a date in most programs is recorded in memory only as "Days:Minutes:seconds since some standard date" you usually can "reformat" a selected date to have about anything you want for the "displayed date" if the original information was entered as a date rather than just as a text string.

Apparently dates are of such diminishing importance that most "news reports" (in some places, especially "blog" type columns) on the web no longer include a date, showing only "x minutes ago" since the attention span of most readers doesn't extend longer than about 3 minutes. This is an exceedingly unfortunate practice for those who think historical context is of any significance, and indicates mainly the popularity of illiterate news writers, but there appears to be no way to stop the trend.

John

Subject: RE: BS: Happy pi day!
From: Doug Chadwick
Date: 16 Mar 13 - 07:45 AM

The British may have the date as "Day, Month, Year" in increasing in order of magnitude but the time is still given in decreasing in order of magnitude of "Hours : Minutes : Seconds".

DC

Subject: RE: BS: Happy pi day!
From: Manitas_at_home
Date: 16 Mar 13 - 09:03 AM

But never Minutes:seconds:hours, eh?

Subject: RE: BS: Happy pi day!
From: GUEST,Doc John
Date: 16 Mar 13 - 09:11 AM

It's also George Ohm's birthday: V=IR and all that. Clearly a Latin man!

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 16 Mar 13 - 10:26 AM

UK syntax means we will have to wait until 31/4/15 (or more accurately 31/4/16 ) - ain't gonna happen.

Subject: RE: BS: Happy pi day!
From: Manitas_at_home
Date: 16 Mar 13 - 12:46 PM

or 22nd July (22/7)!

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 21 Mar 13 - 01:26 PM

approximately July 22

Subject: RE: BS: Happy pi day!
From: SPB-Cooperator
Date: 21 Mar 13 - 02:05 PM

There are two e days, depending on which side of the pond you are on:

2nd July or 7th February

Subject: RE: BS: Happy pi day!
From: GUEST,Eliza
Date: 21 Mar 13 - 06:15 PM

I still find the date of that terrible day at the World Trade Centre difficult to process: 9/11 means the ninth of November for a Brit like me. Yet we in UK still say 9/11 when referring to it.

Subject: RE: BS: Happy pi day!
From: Manitas_at_home
Date: 22 Mar 13 - 04:09 AM

Steve, 7/2 is 3.5, 2/7 is approx .2857. Neither as close to pi as 22/7.

Subject: RE: BS: Happy pi day!
From: Pete Jennings
Date: 22 Mar 13 - 11:13 AM

So, we had an ip day?

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 22 Jul 20 - 03:11 PM

Happy p day.

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 22 Jul 20 - 03:12 PM

Happy Pi Day. (the symbol showed in preview on my previous post!)

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 22 Jul 20 - 04:24 PM

Love this! No Pi day party this year... We had postponed the 3.14 one to 22/7 but nooooo, still not safe. Grumble rhubarb rhubarb. Haha...

My sister who was posted overseas a lot had her kids on 4/4 and 7/7, so they never had to worry about how the date was to be written! She wishes she'd done it on purpose, but she didn't.

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 22 Jul 20 - 04:52 PM

Your sister was posted overseas?
Must have needed a big envelope ;)

Subject: RE: BS: Happy pi day!
From: robomatic
Date: 22 Jul 20 - 06:11 PM

I saw that Nigel posted pretty close to 3:14 by the posting clock. Thought that might be more than coincidence.

Didn't get the 22/7 reference until it was in my face. That's my usual level of attention. Over here we write it 7/22.

Actual rememberance: I was a fast multiplier so I was talked onto my elementary school math team. There must have been some sudden vacancy. We boarded a bus after school to go to another school. No girls. And the boys who'd been on the team before were talking amongst themselves whether or not they could use 22/7ths for this thing called PIE. I had no idea what PIE was!

Subject: RE: BS: Happy pi day!
From: Nigel Parsons
Date: 23 Jul 20 - 06:19 AM

Robo: Over here we write it 7/22.
That's why 14th March doesn't work for us. "14/3"

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 23 Jul 20 - 06:56 AM

Nigel... A crate!

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 24 Jul 20 - 04:27 AM

There are mathematical series that will equate to Pi, or more probably converge.

p/4=1-1/3+1/5-1/7+1/9 .............. etc click for Wiki on Leibniz's method. I will be asking questions later (if I can understand the questions).

to calculate to a trillion decimal places requires calculating each term in the series to 10 trillion DP. Which for 3 or 7 (etc) is going to make for 10 trillion X 10 trillion calcs. (well some terms involving multiples of 5 would reduce that, but not much). And there might be shortcuts with multiples of lower numbers, but that assumes near trillion storage capacity.

I guess they have better algorithms and one discovered in 1995 looks to be easier. My brain is beginning to hurt..............

Subject: RE: BS: Happy pi day!
From: SPB-Cooperator
Date: 24 Jul 20 - 06:26 AM

The problem with this method is that most of the fractions in the iteration are irrational numbers. 1/5 is OK, but if we wanted to calculate to something simple like 100 places then wouldn't each fraction have to be calculated to 100 places, possibly more to allow for guard digits.

Subject: RE: BS: Happy pi day!
From: robomatic
Date: 24 Jul 20 - 11:21 AM

SPB:

Fractions are de facto rational numbers (ratio). How the computers specifically get to the accuracy required is a field that I do not know. But once you establish a provable technique no matter how long the program is you can leave 'em turned on overnight...

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 24 Jul 20 - 12:20 PM

Yea - why does the Pi symbol change from preview to now? (what becomes of ? ?). Some algorithms rely on faster converging series like Arctan(1/3)+Arctan(1/5)+ etc (primes)

The algorithm that I have seen the results for was in 1970ish and that calculated each digit in turn. The time it took was the same (AFAIK) each time. It was a way of checking the computer for spurious glitvhes at that time. I only got to run one of my programs once a week, hand coded on paper and punched by a team of (female) punchists. But they showed us the printout of Pi and that stretched to a computer paper page.
I guess it was correct. I never checked beyond 3.1415926535.
There are stories where the word's first letter is a mnemonic for Pi. - Piphology anyone?

PS FWIW (2.7 trillion as of August 2010)

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 24 Jul 20 - 12:26 PM

OK one more try - π (eg hash code π)

Subject: RE: BS: Happy pi day!
From: robomatic
Date: 24 Jul 20 - 01:03 PM

Very cool red Pi!
As for the 2.7 trillion. I suppose you need a computer to tell you how far it's gone.

There's a Damon Runyon story about a gambler who throws craps into his hat and tells the others that he won. They don't dare disagree with him.

I once wrote a fast fourier transform program using an algorithm out of a book. I think there were a couple of ways to test it. One way was to input a '1' and the output wouild read whatever it read. Then you used all those output numbers as input to see if you got the '1' back again.

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 24 Jul 20 - 01:39 PM

I am reminded of a limerick:

(12 + 144 + 20 + 3 x v4) / 7 + 5 x 11 = 9² + 0

Subject: RE: BS: Happy pi day!
From: Mrrzy
Date: 25 Jul 20 - 01:25 PM

Lemme know if that needs translating...

Subject: RE: BS: Happy pi day!
From: Joe Offer
Date: 14 Mar 21 - 05:46 PM

Here in the United States, today is Pi Day. Somebody sang a song she called "Mathematical Pi."

I think this is it, but we need a transcript.

https://www.marshallmiddle.org/apps/video/watch.jsp?v=139897

https://www.mentalfloss.com/article/23151/mathematical-pi-song

Subject: RE: BS: Happy pi day!
From: Mr Red
Date: 15 Mar 21 - 03:03 AM

UK Commedian Ken Dodd sang "HaPIness - happiness, the greatest gift that I possess"

And got away with it!