SERVING THE QUANTITATIVE FINANCE COMMUNITY

 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 8th, 2018, 9:18 pm

No. The yolk part of an egg has a smaller variance than the white part. The commercial eggs are bigger (have bigger whites or two yolks) because they hens hormonally stimulated and fed more protein. Generally big eggs are not healthy either for those who eat them or the hens who have to lay them.
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 17th, 2018, 10:38 pm

what is the standard when it comes to units

\(\frac{G\times 1 \mbox{ weight unit}}{c^2}=\frac{G}{c^2}= \mbox{ meter}\)

that is output unit is meter as I am looking for in this case, but one could claim 

\(\frac{G}{c^2}\) alone not give meter output, but  \(m\cdot kg^{-1}\) as output, since G is of form \(m^3\cdot kg^{-1}\cdot s^{-2}\)

In other words can I write just \(\frac{G}{c^2}\) and claim output is in meter, because I actually have \(\frac{G\times 1 \mbox{ kg}}{c^2}\), or should I then write out as  \(\frac{G\times 1 \mbox{ kg}}{c^2}\) every time, as then evident output is meter. When multiplying with 1 (unit of something) it naturally only changes the units, not the output number.
 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 18th, 2018, 8:15 pm

Writing another groundbreaking scientific paper or book? The standard is using square brackets (see dimensional analysis).
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 18th, 2018, 8:49 pm

yes i know that ( dimensional analysis, but seems no one has walked this particular theritory...

"Writing another groundbreaking paper"

yes writing a paper, it is not groundbreaking, it is breaking G, not the ground. To break the ground I use my new Lamborghini, except close to my hedge where I have to do fine cutting off long grass by hand (to not damage the Hedge with my over sized Lamborghini) , where the damn snake was hiding. Some hedges are more risky than others!
Last edited by Collector on August 18th, 2018, 9:02 pm
 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 18th, 2018, 9:02 pm

I've seen different conventions, but I think the standard is:

\([\frac{G}{c^2}] \cdot{kg}= \mbox{meter}\) - if you want to talk about units.

\([\frac{G}{c^2}] \cdot{M}= \mbox{L}\) - if you want to talk about dimensions (L and M are length and mass).
Last edited by katastrofa on August 18th, 2018, 9:09 pm
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 18th, 2018, 9:03 pm

good
 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 18th, 2018, 9:09 pm

You're welcome.

BTW, maybe you should follow Paul's example and take fancy of long grass?
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 18th, 2018, 9:14 pm

then he is a hippie! I am not!
 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 18th, 2018, 9:54 pm

To me, both you and Paul are completely alien species.
 
User avatar
bearish
Posts: 3580
Joined: February 3rd, 2011, 2:19 pm

Re: Stupid question of the day

August 18th, 2018, 10:02 pm

i have met both of them, and they're not completely alien. Originals? Yes!
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 19th, 2018, 3:11 pm

Looks like I need the Lambert W function to find some type of maximum I am looking for. In mathematica this is ProductLog function, dose it also exist built into excel under some name?

also since I am new to the Lambert W function, is there any interesting stuff I should know about it? Implementation wise or otherwise?
 
User avatar
ppauper
Posts: 68451
Joined: November 15th, 2001, 1:29 pm

Re: Stupid question of the day

August 19th, 2018, 4:09 pm

In maple, it's LambertW(x)

I first came across it in maple when for some insane reason they decided to make it just "W(x)" in the then-latest version, and since everyone was using (U,V,W) for velocity, it didn't exactly go down well. And they didn't even tell you that W(x) had suddenly become the LambertW function. I had codes that were supposed to be finding W(x) and they were giving gibberish because W(x) had already been defined by the system

I' m sure mathematica can plot it and evaluate it.
 
User avatar
Collector
Posts: 3836
Joined: August 21st, 2001, 12:37 pm

Re: Stupid question of the day

August 19th, 2018, 4:39 pm

yes Mathematica can do it, still struggling with the intuition behind Lambert W...should be a simpler method (to find my Omega point) ...

Closed-Form Representations Of The Lambert W Function

Also 

ANOTHER INCARNATION OF THE LAMBERT W FUNCTION

"The Lambert W function was introduced by Euler in 1779, but was not well-known until it was implemented in Maple, and the seminal paper..."
 
User avatar
katastrofa
Posts: 6115
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: Stupid question of the day

August 19th, 2018, 6:18 pm

Maybe Maple made it well-known to computer guys, but solid state physicists have been using W for solving the particular type of differential equations since Lambert came up with his method.
 
User avatar
Cuchulainn
Posts: 56672
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: Stupid question of the day

August 19th, 2018, 9:21 pm

bearish wrote:
i have met both of them, and they're not completely alien. Originals? Yes!

I met one of them; what's the other one like?
ABOUT WILMOTT

PW by JB

Wilmott.com has been "Serving the Quantitative Finance Community" since 2001. Continued...


JOBS BOARD

JOBS BOARD

Looking for a quant job, risk, algo trading,...? Browse jobs here...