What is Computing: Definition and 730 Discussions

Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes and development of both hardware and software. It has scientific, engineering, mathematical, technological and social aspects. Major computing disciplines include computer engineering, computer science, cybersecurity, data science, information systems, information technology and software engineering.

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  1. B

    Computing the order of a group

    Homework Statement Let a be an element of a group an let |a| = 15. Compute the orders of the following elements of G a) a^3, a^6, a^9, a^12 Homework Equations The Attempt at a Solution for the first part of part a, would a^3 be...
  2. B

    Computing Relative Homology Groups from a Given Map

    Hi, I'm working on some homology problems but I need help figuring out the induced map from a given map, say f:X\rightarrow Y. For example, compute H_* (\mathbb{R}, \mathbb{R}^n - p) where p \in \mathbb{R}^n. So for n=1, we have the long exact sequence 0 \rightarrow...
  3. B

    Computing the homology of R^3 - S^1

    Compute the homology of R^3 - S^1. Actually a friend of mine asked me this question and I came up with the following way to solve this but I'm not sure if it's correct. My analysis: H_0 = Z (the integers) because it's path connected. H_1 = Z (the friend said so but I don't believe...
  4. B

    What is D-Wave's Progress in Quantum Computing?

    Hi everybody, A Canadian company named D-Wave, claims that it has already built a 16 qu-bits computer. This is their website address : http://dwavesys.com They also claim the technology they use is "easily" scalable, and they foresee a 512 qu-bits version in the beginning of 2008, and a...
  5. maverick280857

    Quantum Computing problem [Quantum Teleportation] (Nelson and Chuang)

    Hello I am reading Nelson and Chuang's book on Quantum Computation. On pages 26-7 they describe quantum teleportation. I am facing essentially a math problem in going from the expression \left|\psi_{2}\right> = \frac{1}{2}\left[\alpha(\left|0\right> + \left|1\right>)(\left|00\right> +...
  6. C

    Computing ndA (dS) in Stoke's theorem

    in one side of Stoke's theorem we compute curl(F ) . ndA . When we have computed curl(F ) in x-y-z coordinate, but have parametrized the surface in cylindrical / spherical coordinates, then in computing ndA, we do the cross product of the partials then times that by du dt (or somethin else) ...
  7. T

    Computing axis forces of a construction

    Hi all, I'm trying to compute the axis forces in the construction I put to attachment. I already have computed the R forces, but I don't know where should I start computing the axis forces from, from which point. Could please someone give me some advice? Thank you very much, best regards.
  8. C

    Vision for Wearable Computing: Any Task, Any Environment, Anyone, All the Time

    If the vision for aeronautical engineering is like this: Anyone, anything, anytime, anywhere what would be the vision for wearable computing? Any task, any enviornment, anyone, all the time something like this?
  9. S

    Help computing Christoffel coefficient

    Not so much a homework problem, more needing help understanding where something comes from. I've attached a jpg file with what I need help on. I've done a general relativity course at uni but can't seem to work out what should be a very simple problem.
  10. V

    Computing luminosity from surface brightness

    Homework Statement I'm trying to find the central luminosity per square parsec of a galaxy with central surface brightness I(0) = 15 \; mag \; arcsec^{-1}. I need the answer to be in multiples of the solar bolometric luminosity per square parsec. Homework Equations m_1 - m_2 =...
  11. R

    Where Can I Discuss Scientific Computing?

    Anyone know of a forum where scientific computing can be discussed?
  12. R

    Parallel Computing Operating Systems for the PC

    Anyone know of parallel operating systems designed to work with multiple PC processors?
  13. G

    Quantum Computing: Entangled Qubits & Hilbert Space

    I'm writing a paper on quantum computing. First question: Do entangled qubits, or generally, entangled particles occupy the same Hilbert space? Thanks.
  14. M

    Parallel Universes and Quantum Computing

    If I remember right Paul Davis in his book 'Parallel Universes' suggested that each possible position of an electron represented its place in an atom of a corresponding parallel universe. Does this or a similar/associated principle apply to the operation of quantum computing?
  15. A

    Hint for Quantum Computing Question Regarding QFT's and Eigenvalue Estimation

    Homework Statement I've pasted the actual question below: http://www.zeta-psi.com/aj/qip5b.png I don't think there are many quantum computing specific things here other than the circuit (which I can derive easily if I can figure out the algorithm) Homework Equations The Quantum Fourier...
  16. V

    Computing Potential of a Spherical Shell w/o using Newton's theorems

    Homework Statement I'm well aware of how to compute the gravitational [electric] potential \Phi due to a spherical mass [charge] distribution of radius R by using Newton's theorems for spherical shells. However, how does one find an analytic expression for \Phi without invoking these theorems...
  17. J

    Quantum computing - bloch sphere coordinates

    I have one critical problem with quantum computing. When I have one quantum state on bloch sphere, I do some transformation on that state for example PauliX transformation. As far as I know, we can present quantum state as |y> = cos (theta/2) |0> + e^(i*phi) sin (theta/2) |0> So if we...
  18. E

    Computing Expectation values as functions of time.

    Homework Statement 6) A particle in the infinite square well has the initial wave function Ψ(x,0)= Ax when 0<=x<=a/2 Ψ(x,0)= A(a-x) when a/2<=x<=a a) Sketch Ψ(x,0), and determine the constant A. b) Find Ψ(x,t) c) Compute <x> and <p> as functions of time. Do they oscillate? With what...
  19. S

    Medical Biological components in computing

    Recently, someone pointed me toward this news report, which I have cross referenced (only to find that everyone got their information from the same limited source). http://www.napa.ufl.edu/2004news/braindish.htm" As I understand it, rat neurons formed an interactive network with an...
  20. tony873004

    Computing distance as a function of time

    I want to compute the position of a planet from its star as a function of time. Here is an illustration describing the problem: http://orbitsimulator.com/PF/pft.GIF Each of these 5 planets has a semi-major axis of 1 AU and a period of 1 year. The case of the planet in a circular orbit is...
  21. D

    Decrypting a Large Number for Number Theory Homework

    Homework Statement 14572353050570834605889731500015117386453891958889990^3405172774109177428981695098239611111643842774424445 (mod 17025863870545887144908490224619062098783164408077639)Homework Equations It overflowed PARI and MAPLE. I'm attempting to decrypt a message for my number theory class.
  22. O

    Programs Thinking about getting a PhD in Scientific Computing

    So I've got an MSc in Engineering physics and I'm now deciding if I should go find a job in the industry, or stay in school to get a PhD, more specifically in Scientific computing and numerical analysis. Getting the PhD is very temping, but the main thing holding me back is that I don't know how...
  23. C

    Computing the range for a rational function involving absolute value

    Hi. I need help computing a range. The question is : Find the domain and range of y=\frac{|x+2|}{x}. The domain is obvious, x can't be 0, (-inf,0,) U (0,inf). But how do I find the range?? Can someone help me out? I have tried messing around with the definition of absolute value... if...
  24. S

    Quantum Particle Confined to a Box: Computing & Plotting S(e)

    The energy levels of a quantum particle confined to a cubical box are: E = \frac{\hbar^2 \pi^2}{2mL^2} (n_{x}^2 + n_{y}^2 + n_{z}^2) where nx, ny, nz are postiive integers Define the dimensionless energy \epsilon = E \frac{2mL^2}{\hbar^2 \pi^2} and define S(e) to be the number of states...
  25. D

    Computing a complex matrix exponential

    Dear Members, I have been recently introduced with the concept of matrix exponentials in class. I have been successful with computing such functions as e^{At} where say, A is a 2x2 invertible matrix that has real eigenvalues. When I am presented with a problem such as: D = \D =...
  26. H

    Java Java Numeric Computing: Performance Discussion

    the purpose of this thread is to be a placeholder for discussion about the performance of Java in Numerical Computations. Started as a discussion between CRGreathouse and me about weather or not Java can be used effectively in doing computations. The plan we have: Phase 1: Solve a...
  27. B

    Computing Poisson's Ratio for AISI 1020 Steel Rod

    If you had a 2 inch diameter AISI 1020 steel rod that is 10 feet long. Under an applied load, the rod elongates by 0.48 inches. A). How would you compute the axial strain in the bar? and B). How would you compute Poisson's ratio for the material, if the transverse deformation of the rod is...
  28. J

    Quantum Computing: Exploring Speed Beyond Light Communication

    Hi, Does anyone remember a recent article on quantum computing where they describe incredibly fast computing, even faster than light communication. It describes this as a result of quark pairs being made at the same time. It says being made at the same time they come out as if they are...
  29. P

    How to graph x vs t and find average velocity?

    I'm not looking for answers so much, just someone to get me started. OK, you walk 73.2 m at a speed of 1.22 m/s, and then run 73.2 m at 3.05 m/s along a straight line. What is the average velocity of that problem? Next I need to graph x vs t for the problem, and indicate how the average...
  30. A

    Quantum Computing: Isolating Atoms & Effects of EM Waves

    QC requires atoms to be isolated? because the slightest disturbance can cause its state to be changed and data loss. Are the spin/ angular momentum etc. of a particle affected by em waves? if there's quantum fluctuations in space, so u have virtual particles/energy swapping, and its impossible...
  31. D

    Learn Computing for Physics Degree - Best Language to Start

    i'm going to apply to do a physics degree, and at several open days it's been mentioned that it would be a good idea to have at least a basic knowledge of computing. I've never done any computing before, so what would be a good language to start with, that would probably be used?
  32. T

    Computing Roots of x^2 + 4x + 5 = 0 in Complex Form

    for x^2 +4x +5=0 ,may i know how to compute the roots incomplex form?? the answer is -2+j and -2-j thanx
  33. C

    Computing how car pass the corner

    Hi everyone, I'm developing onlilne game based on car physics, my model already run on the straight but i need to find out how to compute passing the corners. (currently my model calculate high speed that depend on radius and use it until the end of corner) any help will be helpfull or...
  34. D

    Classical computing and quantum computing

    I have a lot of questions Please help me bridging the gap betw classical computing and quantum computing...please.. I can do mathemtic like |0> + <1| on paper and write more computings like that. But I don't understand how to code it in my toshiba computer ? I have some books+materials...
  35. H

    Computing rank of a matrix over a finite field

    How would one go about computing the rank of a matrix over a finite field? Obviously row reduction could be used... is there a better way?
  36. S

    Question about quantum computing theory

    First of all I want to say hello to everyone on these boards, so hello! Everything I say is speculation only from what I've read, for all I know I could be speaking jibberish and not know it. I read a few things about QM, mostly for quantum computers and I came across something that talked...
  37. L

    How to use Quantum computing language (qcl5.0.)

    Can you show me how to use quantum computing language ? I have download qcl6.0 but i don't know how to use it ?:confused: and have you know any solfware can simulate quantum structure ? :biggrin: help me if you can
  38. N

    STL, in large systems sims/high computing performance

    (hehe here's another one for you dduardo :biggrin: ) Does anyone know if STL is used or is capable of being used in large system simulations? Or is it best to write your own datastructtures? Looking to do some computational astrophysics or large neural nets and am not sure whether to use STL...
  39. C

    Nanotechnology and Quantum Computing

    Where do these fields overlap (if at all) and where do they differ? If one was doing Nanotechnology at the graduate level with a BSc in physics behind them, what kinds of courses would one be taking? What about for Quantum Computing?
  40. W

    Computing the released energy of several nuclear explosions

    Hey, I'm new here. After looking around i think this is the right place to post this question thread. I'm interested in a hypothetical question. I know that the EMT formula to calculate the energy released from a nuclear explosion is = Y to the power 2/3 where Y = megatons. What I'm...
  41. C

    Computing differential changes

    A glass hydrometer of mass m floats in water of density p. The area of the neck of the hydrometer is A. The resonant frequancy for the vertical oscillations of the hydrometer is given by f = (1/2\pi) (Apg/m)^(1/2) Calculuate the fractional change in the resonant frequancy when the...
  42. S

    Suggest me a title for the final project in computing.

    Suggest me a title for the final project in computing. Hi, I'm studying for the final year of the Bsc degree in computing. And I have to submit a final year project title on this monday. And all the sugetions that I had were ignored by my superviser. I would be glad if anybody could...
  43. F

    Scientific computing advice needed

    Hello folks, I'm a budding physicist who needs advice on science-related software that's used in The Real World (TM). I've recently had a look at Octave, Maxima, matplotlib (python plotting), gnuplot, Ocaml and "The R environment for statistical computing". Problem is, I can't make up my mind...
  44. M

    Computing gravitational potential for a point inside the distribution

    The gravitational potential, U, can be calculated at any point, \[ {\rm{\vec r}} \], for a mass density distribution, \[ {\rm{\rho (r)}} \], using the formula: \[ {\rm{U = - }}\int_{{\rm{all space}}} {G\frac{{{\rm{\rho }}({\rm{\vec r')}}}}{{\left| {{\rm{ \vec r - \vec r' }}}...
  45. K

    Trees to Loops: Computing SUSY Yang-Mills Amplitudes

    From Trees to Loops and Back Andreas Brandhuber, Bill Spence, Gabriele Travaglini 49 pages, 17 figures http://www.arxiv.org/abs/hep-th/0510253 We argue that generic one-loop scattering amplitudes in supersymmetric Yang-Mills theories can be computed equivalently with MHV diagrams or with...
  46. W

    Quantum Computing Simulation: Possibilities & Limitations

    Is it theoretically possible to simulate a quantum computer by a real one (ie a Turing machine equivalent) even approximately? Any comments? Sorry if this has already been discussed. :confused:
  47. H

    Best Computer for Computing work

    First off, if this isn't the proper place for this, you have my humble apologies. That said, I'm looking at buying a new computer, and pretty much the only thing I do which really requires any processing power is a lot of work in Matlab and Maple. Since it can be quite a pain waiting on slow...
  48. P

    Computing Reaction Forces of Supports A & B with a 2 Degree Load

    guys, how can u compute for the reaction forces of supports A & B w/ a 2 degree load...? a link is provided below thanks! http://img49.imageshack.us/img49/7876/19uh.jpg
  49. H

    Computing Tension and Velocity in a Wire

    A wire with mass (m) is stretched so that its ends are tied down at points a distance (s) apart. The wire vibrates in its fundamental mode with frequency (f) and with an amplitude at the antinodes of (A). [] How would I compute for the tension of the wire? since f =...
  50. S

    Quantum Computing Research: Find Info for School Report

    i have to do a report on quantum computing for school, and i was wondering if anyone knew any good places to find it
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