English Language & Usage: Multi-Layered Discourse Room

tchrist

1:09 AM

Help, I need a smart person.

I need someone to aid and abet my plotting.

I am tired of crappy wind plots.

I have a notion for how to do this better.

That's what everybody does. And it sucks.

Imagine instead a compass dial.

I would say (rho,theta), but I want theta to be from the Y-axis not the X-axis.

But given that, theta-from-Y is the wind direction and rho is the windspeed.

Now, what to do about the time component?

That's easy: you need a Z-axis.

Which means that you end up with a double helix!

Then you could merge those two graphs.

@Reg Do you know any graphing software that would let me produce a helix or double-helix given the right inputs?

I imagine a wind vane spinning around the compass to indicate the direction, the magnitude of the arrow indicating velocity, and the helix is what happens when you graph it against time. If you graph both sustained and gust velocities (yes, velocities, not speed: these have direction) then you would have a clock with two hands on it of varying lengths. If you stack a bunch of these up to represent time, you have a double-slinky.

Hm, I seem to have found a Gmbh company.

Oh good, they have an EN version so I don't have to be dumb.

Think of it as a wind rose where you pull up the slinky.

Cerberus

1:32 AM

Hello.

@tchrist I find those compasses pretty intuitive.

Use the y axis to indicate wind speed (so put the compasses at different heights.)

tchrist

Well, the length of the arrow would be the speed, and the angle would be . . . the angle.

The trick is how to stack those up.

All the plotting stuff I've found does only radial plots, not helical ones.

Maybe it needs fancier 3Dness.

Yes, I know the difference between a helix and a spiral.

This partakes of both because the speed will change.

crl

there's this presentation too windguru.cz/int/index.php?sc=767&switchlang=1 if it helps

tchrist

Needs more vision. :)

I can’t believe we haven’t had a struck–stricken question before.

This is not the answer to my question:

3

Q: Plotting wind speed and wind direction over time

I'm trying to make a plot that can display both wind speed and wind direction over time. A colleague suggested adding a line pointing in the wind direction to each point on a time-series plot of wind speed. I thought it would be fairly simple to calculate the line. I used trig formulas from here...

Although it should be.

I think it will take some sort of 3D modelling software.

2

Q: Plot 3 vectors in 3d

I have 3 vectors , one for angles of Phi , another for angles of Teta , and the last one a vector of points in the Y axe ,after computing the points of Teta & Phi with a function : for teta = 0 : 10^-2 : pi/2 for phi = 0 : 10^-2 : pi/2 Y(current) = v*sin(phi)*sin(teta); T...

matlab plot

Hm.

crl

1:49 AM

earth.nullschool.net/#current/wind/surface/level/… not your problem but a nice job

tchrist

Yes, that is nice.

Oh, it’s very nice! You can rotate and zoom!

Cerberus

@tchrist How do you mean, stack up?

tchrist

Use the z-axis for time, then connect the ends of the arrows as you stack the data for every 5 minutes or whatever.

Imagine a tall stack of Oreo cookies. :)

Cerberus

What dimensions do you need?

tchrist

The length of the arrow is the speed, the angle is the angle, and the 3rd dimension is time.

crl

1:56 AM

would the time axis be vertical or horizontal? just wondering

tchrist

I wish all the matlab answers about 3d plotting on SO gave what it looks like.

I was thinking of time being vertical, but perhaps horizontal would be better.

blogs.mathworks.com/videos/2009/11/17/…

These are all surfaces though.

crl

the visualizations we showed you like that: ← ↙ ↙↘ ↘ ↘ ↘ are just a kind of projection of the 3D representation

tchrist

That’s kinda the idea.

Although I think your horizontal orientation might prove better in the long run.

crl

you could use "wind barbs" for the speed

tchrist

The speed is just rho under a (rho, theta) coördinate system.

So the distance from the origin.

crl

2:04 AM

in 3D it would be great indeed, but you would need to be able to rotate it, else some data can be hidden (wind directions on the y axis if x is vertical)

tchrist

mathinsight.org/parametrized_curve_arc_length

crl

why would you need to measure the arc length of your wind velocity representation?

tchrist

I don't know that I do.

I just notice that that applet generates helices.

crl

oh, I don't have java for my browser

tchrist

4

Q: parametric plot 3D, helix and astroidal sphere

Can somebody help me and write code for this 2 picture in WinEdt (latex) (this is from Mathematica, I write in Mathematica, but I don't know write this code in WinEdt). I tried with "parametricplotThreeD" and I don't know how write code. Help :( Sorry, I don't speak english very well..

graphics 3d

An actual helix would be a constant rho/speed and varying angle. However, both speed and angle vary.

crl

2:17 AM

yep I imagine it

user116848

2:33 AM

@Robusto Nice word. But looks like a difficult one :-)

Robusto

3:37 AM

@tchrist Well, but you'd still need the ability to rotate the graph in three dimensions then.

Cerberus

3:56 AM

@tchrist But what would you need three spatial dimensions for that?

If you show the angle by the direction of the arrow of the little compass as in my graph, you're done.

tchrist

Sigh.

No.

I have failed to make myself understood.

Cerberus

Perhaps.

But it's 5AM and thereby bedtime.

tchrist

Good night.

Cerberus

You, too.

A Beautiful Mind

7:04 AM

Hi.

RegDwigнt

9:07 AM

After reading the questions on the front page right now, I feel like giving up on the site and the humanity at large.

MikhailTal

10:15 AM

Hello, anyone here?

crl

@tchrist you just wanted the time dimension in addition to the arrow showing wing velocity, that's right? @Cerberus

If I understood the discussion last night

MikhailTal

10:34 AM

Can you help me with something?

infinitesimal

Askaway

:-)

MikhailTal

I have this expression in my language that sounds perfect, but not so good in English.

"You have to be 100 steps ahead to be 10 steps in the back".

It is the best translation I can get

It means that in life you have to work hard so that in end, you can manage to be en par with the people surrounding you.

infinitesimal

Staying ahead of the game!

MikhailTal

I was looking of something that involved steps

So that it could look original

It's for an application essay.

I want the expression in a more natural English

The same one that is

crl

@MikhailTal You could keep it like that one, or maybe there's one in idioms.thefreedictionary.com/step

"One step forward, two steps back" almost the opposite meaning no :) ?

MikhailTal

10:47 AM

Thanks

Jez

Ha, I just realized that Firebug replaced their ugly-to-scale raster icon with an SVG:

A Beautiful Mind

11:35 AM

@Jez Hi Jez.

crl

How would you say that "her left heel 'got into' the ground"? sunk? dig ?

In french the word is "s'enfoncer dans la terre"

Jez

11:56 AM

@ABeautifulMind hiya

@crl are we talking stiletto shoes?

crl

@Jez yes

Jez

I'd say "sunk into"

or "got stuck in"

crl

I'll take sank into, thanks

crl

12:12 PM

@ABeautifulMind Why that avatar?

this deep water blue, abysmal blue

►

it shows how strong currents are

►

Mitch

1:40 PM

@crl ha ha yes. It's totally an inside joke by Robusto who is learning Spanish one word at a time and that is a sentence that is about all he can say.

Robusto

2:03 PM

@Mitch More than one word at a time, tyvm.

Cerberus

Yo.

tchrist

Va aprendiendo palabra por palabra.

A Beautiful Mind

2:18 PM

Nessun Dorma

I am very grateful to have Kit in this chat. She has said so many things to help keep me going.

user116848

2:34 PM

Hi!

user116848

Not much activity in chat today.

user116848

Good thing my internet is working.

user116848

3:19 PM

@ABeautifulMind Hi. How have you been?

A Beautiful Mind

@Farooq My mental condition is very very bad now.

user116848

@ABeautifulMind Oh, I am very sorry to hear that.

A Beautiful Mind

But I will try to find a way.

user116848

Yes, life can be difficult sometimes.

user116848

I have had a tough life too in a way.

user116848

3:21 PM

I think no one has it perfect.

A Beautiful Mind

It is true that no one has it perfect, but the point is that some have it much, much harder than others.

user116848

I agree.

A Beautiful Mind

Actually, there might be some, very very few I think, who think they have a perfect life.

user116848

So, talking with folks here elevates my mood too :-)

user116848

@ABeautifulMind Yes, some do have it perfect. Or at least it looks that way.

A Beautiful Mind

3:28 PM

I currently hope to be completely well by the end of next year. It will then be a decade long struggle.

user116848

I hope it works out well for you. Sometimes I suffer from anxiety issues as well. So I talk to people around me (family, friends etc). It helps a lot.

A Beautiful Mind

If you need any help, tell me. I can share my experiences with you with regard to anxiety.

@Farooq It is actually my family and friends who have abused me that led to my mental breakdown. But I have the best mother in the world.

user116848

@ABeautifulMind I see. Yeah, good parents is a must.

user116848

@ABeautifulMind Okay, thanks for the offer.

user116848

So these days I avoid all kinds of world and local news because sometimes it triggers my anxiety. My doctor also told me to avoid stuff that trigger anxiety.

user116848

3:34 PM

But I am very stable :-)

user116848

Just some emotional issues sometimes.

tchrist

4:05 PM

Is this like senility or what?

0

Q: Pronunciation of Fete as in Village Fete

I don't know how this site appeared in my pc, but I was using an old pc. Maybe my Greek Lady companion logged on at one time. She is multilingual whereas I am a Monoglot ( English only, with a Cambridge Celta certificate. I have been trying to learn French only since 1952, but do not hear what th...

pronunciation pronunciation-vs-spelling

Stack Exchange

5:10 PM

Limerick Machine: Today I will make apple pie It is my first time, my first try I hope it won’t taste Like...

posted on January 25, 2015 by sgdi

Today I will make apple pie It is my first time, my first try I hope it won’t taste Like mouldy glue paste Or make me go blind in one eye

A Beautiful Mind

@matt Boo!

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