Lecture 28: Random Numbers - Richard Buckland UNSW (2008)

[loveuala]

his teaching is also as cool as hot as honeymoon.

[jhamien920]

This is just what I was looking for. Thanks for the upload.

[rumidom]

Richard's security lectures will ever be available? it would be awesome

[treweof]

14:40 von Neumann is Hungarian!

[b1naryd1g1t5]

For all you people that say randomness doesn't exist, tell it to the Nobel prize winning physicists that have done work on quantum mechanics for the last century. Read some of Feynman's lectures about quantum electrodynamics. Google the "double slit" experiment. Randomness *is* inherent in the universe (at least at the quantum level). Einstein said God doesn't play dice, but Einstein was wrong for once.

[ladovina100]

@b1naryd1g1t5 i disagree with u,i will just tell you one thing and that is if something look random that doesn't mean it's random it just mean that we are not able to see the pattern...think about that

[4Got10Shadow]

@ladovina100

very good point... thats why we need to seed the time in out system to srand() to provide somewhat random number.

[doh1959]

@Hax0rPr0n wrong it always comes out so the randomness reduces

[doh1959]

iv experimented with random numbers there is some rule of physics goin on that as yet is unexplainable. let me explain and i know you will all disagree when a set of random numbers are created by a physical means you cannot stop the number appearing when a certain mathmatical equation is reached its fukin scary i am getting close to establishing the multiplier to get close to prediction in other words random is really not a true definition

[MrJixies]

Cool Teacher!!!

[txtmate16]

why are most of them asians?is this university located somewhere in asia?Dont get me wrong..im not being racist..i am an asian as well.

[TechApplePie]

I will try to generally speculate why so many asians. First, this is aussie where asia is enormous in size and population and very nearby. Secondly, many of these young students parents may have migrated to austrailia to get to more free land than their communists and socialists home countries. Now they have grown up in Australia and it is onlynatural to go to aussie uni. That and i have more theories as well.

[Stevenup7004]

I'd assume because Australia is probably the most developed country South of Asia, a lot of Chinese students would go there to study.

[sspoke]

nope its not random atomic radiation looks random because we don't look deep inside to find the cause

everything has a cause that produces a effect.

[ericcartman888]

god does not play dice

[sspoke]

owned biatch

[doglin82]

@ericcartman888 how good is god?

[sspoke]

why do u gotta sqaure etc thats turning something as easy as squaring numbers into crazy math.. If i wanted to code a simple random generator function I'd just start with the first two numbers such as 12 and add up the number before it 12 2+1 123 3+2 1235 5+3 12358 8+5 (here you get double digits now you use moduls) int oa = 1, ob = 2; int nextRnd(int oa, int ob) { ob = oa + ob % 9; oa = ob; }

[sspoke]

nothing in this world is random not even dice..

If you knew the physics behind it and computers got that already anyways if you knew how you threw it the speed of it the wind etc whatever nothing would be random and still nothing is random not even how atoms bounce knowing the old bounce could predict new bounce.

But if you want it as mysterious as a dice.. try using modulus (% with computer time (clock))

[sspoke]

nothing is random PERIOD.. not even vibrations man

only reason your quantum universe is based on uncertainty and chance is because your looking at the variables incorrectly..

man its hard to explain things to narrow minded people they will never understand.. they believe books more then they believe logic/common sense.

[royb673]

perhaps narrow mindedness is to rely on 'common sense' and intuition, instead of cumulative objective evidence.

there are many examples of counter-intuitve facts

...including the established principles of quantum mechanics.

chaos is the nature of reality

[sspoke]

dude the reason its uncertain in the quantum field is because the tools used have very bad resolution to the level you are trying to reach the real universe (space is the same) if you don't have a powerful telescope u can't see far.. not the opposite to see deep into small things..

hell a bit of a wind/noise from atomic structures could trigger the randomness you call random even in a VACUUM chamber realize atoms are not squares they are round

round = bad insulator

[sspoke]

I have no idea how it cannot be common sense to rule out random?

I believe the universe is a gaint virtual program where it runs of.. a based set of constants for some things and the rest are all equations which generate in your case a random but after all it's still just a equation.. I guess im not getting anywhere with you..

thats why time travel in the past in my mind is not existing.. but time travel to the future is like common sense to me.. that it will work... aka freezing/coma/slow/etc

[sspoke]

right not idea that the smallest particle is color pigment is only judged by the human sense of sight.. what if we judge by the sense of hearing.. or tasting.. you cannot really tell which sense equals everything.. maybe we don't even have that sense that can tell the answer.. we are depending on our senses (hope u understand)

i am not a man of big words but i am goddamn the most logical man in this world.

[sspoke]

whatever you won't understand what i mean.. but the smallest particle possible in this world is indeed color dots forgot the name for em but they are Blue Yellow and Red and that is what drives our universe (Not the RGB don't get confused with Tv/computer color mixing)

it could go further but its out of our reach..

Thats like saying if you were a animated AI on a computer that you could access your microprocessor you can't because you have no physical link to the other dimension.

[schlengar]

You certainly mean Quarks and Gluons :-)

But you are talking about an interesting topic - most physicists think, that there is indeed an uncertainty inherent in nature, but on the other hand, there is tho so called "Bohmian Mechanics", based on Dirac's idea of a leading wave function - and this avoids uncertainty and is completely deterministic :-)

[sspoke]

are you certain god didn't tell you to write that.. u cant be certain of anything dude cause its obvious everything is prewitten by the holy God