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01:27
I need to get hands on Office 2013
 
6 hours later…
07:37
@GauravJain microsoft.com/office/preview/en There you go
 
1 hour later…
09:06
in Root Access, 3 mins ago, by Shiki
Found a cool project yesterday: http://cnx.org/content/m15641/latest/
Project that removes lame background laughter from US TV shows
 
5 hours later…
13:51
@IvoFlipse I love CNX! My thesis advisor was was of the people who started it in Rice University. He writes DSP articles for it all the time. At least he used to.
I just wish I had enough knowledge of this stuff to come up with it myself or at least apply it
btw Udacity's Algo class also just covered heaps just now
quite nice explanation too
14:11
Quite nice explanation of Work being F * delta x
14:44
@IvoFlipse I like that. Is that from Udacity?
Yeah, PH100
It gives me back some confidence that I can solve most problems trivially, because this is my turf :P
It also shows why my Math knowledge is so limited
you hardly see integrals or 3rd order stuff in here
@IvoFlipse When I used to tutor physics in college, this was one of my favorite problems = )
I got it right, but I must admit, it took some tries to figure out how I was supposed to use the 20m correctly
= )
darn, need to cook
Yeah, let me know if you more more insight into this things. I think I'm still pretty good at kinematics.
15:34
this quiz was actually fun :P
Hehe, well I should be alright, kinematics was part of my masters too
hey guys
@IvoFlipse thanks for the office 2013 link
Hey all!
@Phonon Yeah Ive come across CNX but ... what exactly is it? I mean "Connections"? Connections to what?
Is it just a DSP wiki esque type site?
15:50
@Mohammad It was started by a bunch of guys at Rice. It renders LaTeX scripts into readable web pages. So you can download a LaTeX-rendered PDF of every page.
@IvoFlipse Sydney Burrus, a very influential researcher in filter design was one of the people who started it, so it's got a lot of DSP on it.
@Mohammad You can basically register an account there and publish whatever you like.
16:08
Hey, anyone interested in joining a team for the Udacity HS Challenge? We need your help right now :)
Thanks in advance!
@jellyksong I don't think we're allowed to participate. We all have graduate degrees.
(I think we all do)
Oh wow that's pretty impressive
Nah, group members can be anyone though, regardless if you have a graduate degree!
@jellyksong So what are you guys doing?
Right now our team is basically students from our high school + a high school in Singapore. We also did some online recruiting so there's other members from all over.
@jellyksong So is the challenge just taking classes?
16:12
We're currently the 4th largest team according to their rankings.
@jellyksong Or is there something else to it?
Pretty much, you get a point for each unit of a class you complete.
The team with the most points wins
(at the end of august)
@jellyksong sure, sign me up. I'm only taking one class right now though.
sure, thanks so much! and even one class will definitely help us
just click the blue "Join" button if you're already logged in
@jellyksong done
16:17
@jellyksong I already finished all courses except crypto :P
@IvoFlipse is taking a whole bunch. We'll se what he says once he's back
@IvoFlipse haha, yeah, there he is
@jellyksong Am taking the stats one now. Nice refresher but also filled some gaps here and there!
haha I see
thanks :)
16:19
@jellyksong good luck
Be sure to keep visiting this room @jellyksong
Something tells me I need can ignore the mass of the vehicle when deriving its maximum speed
@IvoFlipse Reminds me a lot of Antoine de Saint-Exupéry's drawings in Little Prince = )
@IvoFlipse yeah sure I'm taking classes too so this will be helpful
@Phonon BTW ... the iPad... omg. I like.
@Mohammad hehe, I like my Nexus 7, too.
16:21
@Phonon I took a look at some of the whiteboard apps ... very promising.. I think we'll be able to do some DSP teaching soon - we have to experiment with each other first though.
@Phonon ...wow that came out wrong.. 0_0
lol
@Phonon You got a Nexus 7? How
@Mohammad You could try Hangouts
@IvoFlipse Hmm .. besides video what else does it allow?..
@Mohammad I think you can use Google Apps, like presentations or Google Docs
@IvoFlipse @Phonon @jellyksong @GauravJain @Kortuk Raise your hand if you have an iPad and/or nexus.
@Mohammad <Hand ^ >
16:24
@Mohammad I have a computer and a galaxy phone. I might get a kindle fire, but paying more then that for a tablet will not happen for me.
@Mohammad ipad!
Or any other iOS or Android tablet I guess
so <hand down>
@Kortuk any hints to help me solve the problem in the picture above ^^
@jellyksong Hmm ok! Interested in learning DSP over the iPad?
16:26
@Mohammad iPad and Galaxy Nexus and waiting to buy a Galaxy Nexus when I get to Canada
@Mohammad Maybe you should specify what DSP is first = )
@Phonon He will get that in lesson # 1 lool :P
@Mohammad hahahahaha
@IvoFlipse You just need to find the point that the force being applied by the motor matches the force applied by friction
@IvoFlipse It will have a V term in it and you can solve for that.
Since the motor is applying a constant force and the friction is a function of velocity just figure out where they match
@jellyksong Digital Signal Processing. A very powerful technique for digitized signals - but can also be used for other types of discrete data as well.
16:27
@IvoFlipse That make sense?
@Kortuk So what formula should I be using, given that I don't know its mass (which I guess is unimportant, since it only has air resistance)
@Mohammad huh how does that work?
@Kortuk Definitely, when the force of friction becomes too large, it can no longer accelerate
@Mohammad Yeah, I can be your Ginnie pig. Just have to find an Android app that works as well
@Phonon Hangouts :P
16:29
@IvoFlipse We need a whiteboard
Hehe, we both point to the same thing
@IvoFlipse ugh, now you are doing something I never do.
@Kortuk Which is? Actually calculate something? :P
@IvoFlipse Ouch!
@IvoFlipse Doing mechanical motion.
In all reality, I never convert an amount of power into a force.
give me a moment.
@jellyksong Well the thought is, you will be able to get tutor-on-demand via your ipad or other tablet, etc. We will find some way to communicate with you, (facetime/google hangout / skype), with a whiteboard app running in the background, so we will be able to see each others' drawings in real time, as we explain stuff
@Phonon Ooo nice find..
Hehe, what I did @Kortuk was take P = F * v
@IvoFlipse I am pretty sure your power is a measure of your velocity*force you are applying.
@Mohammad can't everything just be done on the computer?
F = b * v^2
So P = b * v^2 * v or P = b * v^3
@IvoFlipse Yes, it seems like such an odd way to do it.
16:34
So I take the cube root of P / b and voila: solved
@Phonon Holy jebus....
@Kortuk well technically I'm just substituting things
@IvoFlipse Good job. I thought that was it for a while but kept reading to understand it.
@IvoFlipse but you get the idea. well done mate. Before I could even answer.
@Kortuk I couldn't remember how to do it with my calculator though
@Kortuk @IvoFlipse That's exactly what I call "Doing science via doing science versus doing science via recipes".
16:35
@Phonon Hehe, like the rollercoaster example above, I dig that one
Honestly this PH100 would be a great high school course
or at least entry level physics in college
@IvoFlipse Totally
@IvoFlipse you have never lived till you have solved for the force the track exerts on a coaster going down a spiral.
I hated that test.
1 hour ago, by Ivo Flipse
user image
I am on vacation and off I go again.
@Kortuk Hehe, chillax
16:37
@IvoFlipse ha.
Anyway, I think my lasagna should be done by now
@IvoFlipse ours was a spiral down in a circle and we had an equation of how it was accelerating and we had to find how much of its weight was on the track and how hard it was trying to fly off the track and make an equation. It was terrible.
@IvoFlipse Haha. Lasagna!
@IvoFlipse This exact problem i think they do in physics in intro physics.
haha we actually completely skipped friction in my physics class
16:40
@IvoFlipse they did change it up, there is often the discussion of how fast so that it does not fall off from gravity.
@jellyksong friction and air resistance are a pain to actually solve for. Air friction is a function of V^2 so you get a differential equation that you have to solve numerically for normally. The aerospace guys at my university used to always talk about how hard it was ;)
@IvoFlipse @Kortuk If that track is actually drawn as a precise scaled model, no amount of kinetic energy would save you from horrible death.
Now I am off. later guys, we shall talk again soon.
17:23
@Kortuk That's why they should teach students python so they can simply solve it and move on to more interesting problems
@IvoFlipse no iphone/ipad/nexus :)
lame ;P
What DO you have? ;)
hahaha
samsung omni II
ah yeah, I know that model, they didn't have Android back then did they?
nope
its a touch screen with good bluetooth and wiifi
more than enough for me
i had iphone in 2009
i returned it as I did not like it :)
17:49
@IvoFlipse those numerical issues are not the easiest to solve and the implementation of the solution normally affects it greatly.
@Kortuk True and while the ability of students to guesstimate orders of magnitude sucks, I bet if you'd hook it up with a physics engine like in the Source engine, they'd see quickly enough whether their estimate was correct :P
But honestly, calculating angular velocity gets a lot more interesting when you get to swing a wii controller
rather than having to calculate some imaginary pendulum
@GauravJain Rightly so :P
@GauravJain Btw you have a desktop which pwns all the alternatives
@IvoFlipse How are you putting those pics up? Just print screening?
@IvoFlipse this part gets messy, I really am not sure this is the best way, but i understand your thought.
darn that problem is nasty, because the ground is actually lower than the end of the ramp :P Now all my calculations are wrong
I need to to actually start driving so I will talk to you guys later.
17:54
@Mohammad Yeah, I use Greenshot, which puts it in a folder and auto-saves it, since I use it so often, I never have to browse folders and its always the newest image
@Kortuk Later
hehehe :)
w00t, I managed to solve my problem
18:16
Btw I just came across an article we had to write about the most subject I had in grad school: energy flow models. Which is being used to predict the best strategy for things like cycling matches or speed skating
@IvoFlipse Very cool paper dude!
Yeah that topic was very interesting
Though I ranted about our prof, because he had us use cumsum rather than an integral :P
18:53
@IvoFlipse niiice = )
Hehe, I've opened a whole bunch
I should install an extension that blocks me from reading articles after I've read x per day :P
This seems related to my work
 
1 hour later…
20:09
Neural nets for Vision from CVPR 2012 part of a workshop about deep learning
@IvoFlipse Hey, that's from NYU. = ) Cool!
That's probably Yann LeCunn's group then
Seems so
Man I wish they made a coursera course about deep learning
Or I wish I could attend one of these talks, because man those are a lot of slides
@IvoFlipse What exactly is deep learning?
@IvoFlipse So you learn features on different scales?
20:14
Basically use ICA to decompose some input, then stack multiple layers of these systems, that learn features from simpler features
interesting

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