Archived threads in /sci/ - Science & Math - 191. page

>graduate
>associates degree

>>9099221
It's called a diploma here

File: bearPiano.png (264KB, 481x527px) Image search: [Google]

264KB, 481x527px

>>9099196
all good dude, just try
most entry level jobs expect that you are shit anyway, youll learn on the job

surprised though, nothing?
Only reason I learned in my CS classes was because I wanted to be better than everyone else in the course. I was, except this one fag whose been writing code since he was 10 on thinkpad running gentoo.
WHICH ONE OF YOU FAGGOTS WAS IT

>>9099082
What types of questions appeared on your exam? Can you restate some problems? I'm mostly curious what rigid body dynamics is about for I have no clue

>>9099105
Physics problems with moving bodies rather than point masses. Pendulums, gears, that sort of thing.

One problem was:

Pendulum AB (a 2kg, .2m ball attached to a 1kg, 1m arm) swings 90° down from a horizontal position and strikes hanging sphere C (5kg, 1.2m) with a coefficient of restitution of 0.5. What is the angular velocity of each in the instant after impact, and how high will the pendulum swing back up?

>>9099115
Thank you anon for answering. I'm happy for you being able to attend such classes, I wish I could too. I hope you pass the exam.

>>9099062
>>9099063

Apparently, they say there's no such a thing as the "curvature of space".

But I know nothing about these things. Can anybody activate my neurons pls?

>>9099062
>>9099063
these roleplayers are retarded and ignorant but you're more retarded if you attempt to engage them

placebo effect I suppose

>>9098987
>I may get depressed because of the whole talk about it and the acceptance speech she'll give me.
>How is that called?

Being a little bitch sounds about right.

>>9098987
I think this is my problem actually. For years I've had constant brain fog, low motivation, fatigue, etc. Every doctor I've been to has diagnosed me with depression/ anxiety and put me on antidepressants. I've been on Lexapro, Prozac, Zoloft, Paxil, Effexor, Fetzima, Viibryd, and Wellbutrin and don't feel any different. The thing about those drugs is they don't make you happier unless you're depressed. I've recently come to the conclusion that I don't have a chemical imbalance and maybe I just think I'm depressed because everyone tells me I am.

I think I probably have some physical problem, like Chronic Fatigue Syndrome which sounds more like my symptoms, and just need some modafinil/ low dose ADHD meds, but it's hard to get doctors to consider any differential diagnosis when the antidepressant reps are buying them dinners and cruises and shit.

Ivies don't let in students who don't know how to read.

>Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

>If you want advice regarding college/university or your career path, go to /adv/ - Advice.

Bra total retard myself I'd say your chances at undergrad are no. Try to get into the best school you can for undergrad and do the best you can and then go to the best school you can for masters and you might have a slim chance of going for phd but in my retarded opinion, unless you're a romantic underdog or a legacy, by the time you are good enough for a school like that you'll be good enough to not need it. Like y'know Bill Gates dropped out of Harvard because he literally didn't need it

You have a 0% chance of an Ivy League undergraduate acceptance. Go to the best/most affordable state school you can and get good grades, do research, and build a good rapport with your professors. Think big fish small pond. Getting into and Ivy grad school at this point will be exceedingly difficult, but not impossible. Some accept 4 students a year , you're competing with the crime of the crop of the entire world . Don't go to an unfunded phd , if you're already in debt then you don't want to take on more . Hey I to the best program you can, even a bad one will probably open up opportunities if you really put your nose to the grindstone .
>Source: I go to Harvard

>>9098951
I remember using Pascal's triangle to answer a math question in high school. Got an A in that question too.

File: 1501275995647.png (2MB, 1202x910px) Image search: [Google]

2MB, 1202x910px

Threadly reminder to work with physicists.

How do I get good at graphing equations? I'm prepping for the Oxford interview, and they often ask you to graph unusual functions and discuss their behavior.

Here are some example problems:
#1: Sketch y = 1/x^3 + x
#2: Sketch |y|^(1/2) = 1 - |x|^(1/2)

And then they might ask you to describe how the graph of #2 changes as the exponent varies (e.g. "what would it look like if it were 1/3 instead of 1/2?")

How do I get good at identifying the behavior of and being able to graph any function thrown at me?

Bonus: More specifically, how do I learn how to graph equations with operations on the y? What can I do that will make me be able to sketch something like tan(y) = x^2

>other ideas
write them out by hand

>>9098918
Rank can't be three unless the matrix is the identity. The matrix is singular or the identity.

>>9098918
>https://projecteuler.net/problem=572
I would just look at how other people solved it. If you don't know already, their solutions will teach you.

putting dumb people on TV in a way relieves viewers of the burden of trying to be intelligent. It normalizes brainlethood. You already knew the answer.

He's laughing because he knows he's the one who'll get laid tonight.

>>9098924
>He's laughing because he knows he's the one who'll get laid tonight.
Yeah, because women as a whole tend to only care about arbitrary qualities that don't indicate much at all about the quality of a mate.

Inverse square law.

>>9098325
>why is the inverse square law true
Do a derivation m8.
It also applies to the flux from a radioactive source, but that's because of the solid angle.

>>9098333
I didn't know there was something called the inverse square law.

>>>/wsg/1823407
vid related

>>>/wsg/1823431
posting more exercises

>>9097496
>So the transfer function has one pole at b1, and one zero at 0, right?
Yes.
>Why is this a "one-pole" filter then, and not a "one-pole one-zero" filter?
Commonly you'd say that the order of the filter is 1. In any case, it doesn't really matter since the order of the numerator and denominator polynomials are equal after simplifying.
>Also, why do they write transfer functions of continuous systems as rational functions of "s", but for discrete systems they use rational functions of "z^-1"?
It's to distinguish the transforms used. Discrete systems use the Z-transform, whereas continuous systems use Laplace transform, which uses s. This saves some headache when you notice that you can find a function that maps one plane to another. This is sometimes used when you have a readily designed continuous filter, and want a discrete version of it, so you just "go from s-plane to z-plane" using bilinear mapping or a similar method. Study the stability areas and relation to Fourier transform to get some insight on how s and z relate.

>>9097496
>Also, why do they write transfer functions of continuous systems as rational functions of "s", but for discrete systems they use rational functions of "z^-1"... wtf? Why don't they use "z" for discrete systems too?
In addition to >>9097752 the discrete transfer function in z^-1 comes naturally after aplying the Z-Transform to sampled functions. Transfer functions in z^-1 also allow you to readily convert a discrete transfer function to a difference equation, in the same manner you get a differential equation from a continous transfer function.

>Transfer functions in z^-1 also allow you to readily convert a discrete transfer function to a difference equation, in the same manner you get a differential equation from a continous transfer function.

But isn't this true for the continuous case as well?

I mean, we write H(s) = 1 / (1 + s)
instead of H(s) = s^-1 / (s^-1 + 1).

Why is it better to use s instead of s^-1 in the continuous case, if z^-1 is preferred in the discrete case? To me they look pretty similar; i.e. integrator = s^-1, delay = z^-1
Yet for some reason the literature uses s for continuous transfer functions, and z^-1 for discrete ones as the "canonical" form...

File: autism.jpg (29KB, 363x499px) Image search: [Google]

29KB, 363x499px

>applied category theory
say no more

>>9097359
I tried getting into category theory, but my math knowledge might be too low for it. Either try David Spivak's Category theory for the Sciences or Milewski's blog/video lecutre series for programmers (don't know any other references that aren't just for math in some way). If your definition of "applied" is a little more lax, try Algebra Chapter 0. It applies category theory to abstract algebra.

>>9097359
conceptual mathematics a first introduction to categories 2nd

>>9097313
so what if they are? They spend a little money for a less congested parking lot and to feel good about an environmental deed

literally what?

>>9097313
What are you talking about? They're making more money by charging for parking.

>>9097275
i dont think so because you need all the data, all the input causes to do that and you dont have it.

but look up variational bayesian methods. geoff hintons late 80s/early 90s papers on EM, autoencoders and free energy minimisation.

also tomasso poggios regularization.

File: 1490137443281.jpg (393KB, 1920x1080px) Image search: [Google]

393KB, 1920x1080px

>>9097275
If you can reasonably know most of the important parameters of the system you might be able to make somewhat accurate predictions with computational methods rather than mathematical ones. ABM, perhaps

File: 1Dchaos.jpg (68KB, 576x165px) Image search: [Google]

68KB, 576x165px

No. Number of variables doesn't much matter, there are multivariable systems we can predict well and single variable systems that are chaotic.
Chaotic systems are fully deterministic so in principle you can use them to make accurate predictions but they are characterized by exponentially fast divergence of initially infinitesimally close trajectories, ie small changes in initial conditions very quickly make a huge difference.
Even if you had a complete multivariable model and unlimited computing power the weather is chaotic. The model's predictions from temperature=30 would be completely different to temperature=30.000001 after a few days. That's why weather forecasting sucks.
>one day suddenly was some breakthrough
To be useful for predictions the breakthrough would have to be in data measurement. But as the time the predictions are accurate for increases linearly the required data precision increases exponentially so there's not much hope for future 100 day accurate weather forecasts anyway.

>>9097227
I don't know, but certainly I'm going to apply.

>>9097229
>fucked up my trip

>>9097227
learn better fucking grammar maybe.