In article , John Nagle
wrote:
> Then upgrade to 3D. You can represent latitude and longitude
> as a 3-element unit vector. (GPS systems do this; latitude and
> longitude are only generated at the end, for output.)
And annoyingly so. Somebody I know was building a tracking system based
on a
On 10/10/2013 6:27 PM, Steven D'Aprano wrote:
> For what it's worth, there is no three-dimensional extension to complex
> numbers, but there is a four-dimensional one, the quaternions or
> hypercomplex numbers. They look like 1 + 2i + 3j + 4k, where i, j and k
> are all distinct but i**2 == j**2
On Friday 11 October 2013 12:49:40 Roy Smith did opine:
> In article ,
>
> Oscar Benjamin wrote:
> > If someone tried to explain why their field couldn't use ً for the
> > circumference of a unit circle I would suggest that they adjust the
> > other parts of their notation not ً (there are othe
On Fri, 11 Oct 2013 10:05:03 -0400, Roy Smith wrote:
> In article ,
> Oscar Benjamin wrote:
>
>> If someone tried to explain why their field couldn't use ð for the
>> circumference of a unit circle I would suggest that they adjust the
>> other parts of their notation not ð (there are other uses
In article ,
Oscar Benjamin wrote:
> If someone tried to explain why their field couldn't use ð for the
> circumference of a unit circle I would suggest that they adjust the
> other parts of their notation not ð (there are other uses of ð.
Pi is wrong:
http://www.youtube.com/watch?v=jG7vhMMX
Oscar Benjamin writes:
> tried to explain why their field couldn't use π for the
> circumference of a unit circle I would suggest that they adjust the
> other parts of their notation not π (there are other uses of π.
There's τ for the full circle; π is used for half the circumference.
--
https
On 11 October 2013 10:35, David wrote:
> On 11 October 2013 12:27, Steven D'Aprano
> wrote:
>> On Fri, 11 Oct 2013 00:25:27 +1100, Chris Angelico wrote:
>>
>>> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
BTW, one of the earliest things that turned me on to Python was when I
disc
On Thu, 10 Oct 2013 14:12:36 +, Grant Edwards wrote:
> Nope. "i" is electical current (though it's more customary to use upper
> case).
"I" is steady-state current (either AC or DC), "i" is small-signal
current.
--
https://mail.python.org/mailman/listinfo/python-list
On 11 October 2013 12:27, Steven D'Aprano
wrote:
> On Fri, 11 Oct 2013 00:25:27 +1100, Chris Angelico wrote:
>
>> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>>> BTW, one of the earliest things that turned me on to Python was when I
>>> discovered that it uses j as the imaginary unit, not
On Fri, Oct 11, 2013 at 11:13 AM, Dennis Lee Bieber
wrote:
> On Fri, 11 Oct 2013 01:20:01 +1100, Chris Angelico
> declaimed the following:
>
>>
>>This belongs in the Izzet League, I think.
>>
> Was that an MtG reference?
It most assuredly was. The Ravnican guild known as the Izzet League
On Fri, 11 Oct 2013 00:25:27 +1100, Chris Angelico wrote:
> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>> BTW, one of the earliest things that turned me on to Python was when I
>> discovered that it uses j as the imaginary unit, not i. All
>> right-thinking people will agree with me on t
On 11 October 2013 06:29, Oscar Benjamin wrote:
>
> I learned to use i for sqrt(-1) while studying theoretical physics.
> When I later found myself teaching maths to engineers I asked why j
> was used and was given this explanation. I'm still unconvinced by it
> though.
Please don't be. We need d
On 10 October 2013 15:34, David wrote:
> On 11 October 2013 00:25, Chris Angelico wrote:
>> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>>
>> I've never been well-up on complex numbers; can you elaborate on this,
>> please? All I know is that I was taught that the square root of -1 is
>>
Am 10.10.13 18:54, schrieb Grant Edwards:
On 2013-10-10, Chris Angelico wrote:
On Fri, Oct 11, 2013 at 1:12 AM, Grant Edwards wrote:
Nope. "i" is electical current (though it's more customary to use
upper case). "j" is the square root of -1.
and that hypercomplex numbers include i, j, k,
On 10/10/2013 07:20 AM, Chris Angelico wrote:
On Fri, Oct 11, 2013 at 1:12 AM, Grant Edwards wrote:
Nope. "i" is electical current (though it's more customary to use
upper case). "j" is the square root of -1.
and that hypercomplex numbers include i, j, k, and maybe even other
terms, and I n
On 2013-10-10, Chris Angelico wrote:
> On Fri, Oct 11, 2013 at 1:12 AM, Grant Edwards
> wrote:
>> Nope. "i" is electical current (though it's more customary to use
>> upper case). "j" is the square root of -1.
>>
>>> and that hypercomplex numbers include i, j, k, and maybe even other
>>> terms
On Oct 10, 2013, at 10:12 AM, Grant Edwards wrote:
> On 2013-10-10, Chris Angelico wrote:
>> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>>> BTW, one of the earliest things that turned me on to Python was when I
>>> discovered that it uses j as the imaginary unit, not i. All
>>> right-t
On Thursday, October 10, 2013 8:04:00 PM UTC+5:30, David wrote:
> I have never heard the term "hypercomplex" numbers. I guess you
> are referring to vectors with more dimensions than two. A three
A generalization of quaternions :
http://en.wikipedia.org/wiki/Hypercomplex_number
http://en.wikipedia
On 11 October 2013 00:25, Chris Angelico wrote:
> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>
> I've never been well-up on complex numbers; can you elaborate on this,
> please? All I know is that I was taught that the square root of -1 is
> called i, and that hypercomplex numbers include
On Fri, Oct 11, 2013 at 1:12 AM, Grant Edwards wrote:
> Nope. "i" is electical current (though it's more customary to use
> upper case). "j" is the square root of -1.
>
>> and that hypercomplex numbers include i, j, k, and maybe even other
>> terms, and I never understood where j comes from. Why
On 2013-10-10, Chris Angelico wrote:
> On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
>> BTW, one of the earliest things that turned me on to Python was when I
>> discovered that it uses j as the imaginary unit, not i. All
>> right-thinking people will agree with me on this.
>
> I've never b
On 10/10/2013 14:25, Chris Angelico wrote:
On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
BTW, one of the earliest things that turned me on to Python was when I
discovered that it uses j as the imaginary unit, not i. All
right-thinking people will agree with me on this.
I've never been w
On Fri, Oct 11, 2013 at 12:09 AM, Roy Smith wrote:
> BTW, one of the earliest things that turned me on to Python was when I
> discovered that it uses j as the imaginary unit, not i. All
> right-thinking people will agree with me on this.
I've never been well-up on complex numbers; can you elabor
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