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. E

    Computing $\sigma_N(f;t)$ from $s_n(f;t)$

    suppose, s_{n}(f;t) = \sum_{k=-n}^{n}\widehat{f}(k)e^{ikt} and \sigma_{N}(f;t)= \frac{1}{N+1}\sum_{n=0}^{N}s_{n}(f;t). how do i get from this \sigma_{N}(f;t)= \frac{1}{N+1}\sum_{n=0}^{N}s_{n}(f;t). to this \sigma_{N}(f;t)= \sum_{n=-N}^{N}(1-\frac{|n|}{N+1})\widehat{f}(n)e^{int}...
  2. J

    Computing with rational exponets

    Homework Statement Solve \int_-1^1 (x^{4/3} + 4 x^{1/3}) dx Im having difficulties in algebra when solving this problem. Homework Equations The Attempt at a Solution \int_-1^1 (x^4/3 + 4 x^1/3) dx = 3/7 (1)^7/3 + 4 3/4 (1)^4/3 - 3/7 (-1)^7/3 + 4 3/4 (-1)^4/3 = 3/7 +...
  3. M

    Computing mass with a denstiy function

    Homework Statement Compute the total mass of a wire bent in a quarter circle with parametric equations: x=cos(t), y=sin(t), 0\leq t \leq \pi/2 and density function \rho(x,y) = x^2+y^2 Homework Equations not exactly too sure which equations if any i need to use. maybe the jacobian...
  4. Pythagorean

    Medical What is Computing with Real Neurons and What Research Exists in This Field?

    Is there a name for this or any research in it? I remember this: http://www.wired.com/wiredscience/2008/08/how-to-train-yo/ but I can't find anything else like it.
  5. M

    Computing Hamiltonian matrix for a 1-D spin chain.

    I'm not going to "follow the template provided" in the strictest sense - but I'm going to include all the same information expected - statement of the problem and a showing of how I've tried to do it, in the intended "spirit" of the template, since these different components are kind of "mixed"...
  6. L

    Which Canadian universities offer MSc and PhD programs in Quantum Computing?

    Hi gays, Can anyone help me to find an excellent university in Canada that offers Msc and Phd on Quantum computing?
  7. M

    Courses Useful courses for topological quantum computing

    I recently took a great interest in topological quantum computing - so great an interest I am even considering it as a thesis topic for grad school (though I am still a junior undergrad and have awhile to figure that out). What would be some useful courses to take to pursue theoretical research...
  8. W

    Computing Circulation in Pipe Flow using Velocity & Angular Direction

    I need to find the circulation for a flow in a pipe. I'm using the velocity in the angular direction (cylindrical coordinate system). Am I right in thinking that an ideal vortex is one where there is no vorticity? That would mean there is no circulation. It's strange, because the velocity is...
  9. Q

    Computing a Geometric Power Series with Cosine Terms

    Homework Statement Compute \sum_{n=0}^{\infty} p^n cos(3nx) for \abs{p} \textless 1 , where p \in \mathbb{R} . Homework Equations The Attempt at a Solution I was thinking that maybe this could be approached as a telescoping series, but I'm not really sure if it is. Would that...
  10. K

    Computing Per-Minute Storage for Full HD TV

    Homework Statement This question isn't that hard just confusing: Write a program to compute the per-minute storage requirements for “full HD” TV at 60 HZ (60 frames per second) where each frame is captured at a resolution of 1920×1080 pixels using 24-bit color. Homework Equations 1 pixel...
  11. G

    Computing semimajor axis from ecentricity and period

    Homework Statement Compute the semimajor axes "a" of Halley's Comet. Given: orbital eccentricity e = 0.9673 period P =76 days (2.39674E9 seconds) Gravitational Constant G = 6.67428E-11 solar mass M = 1.9891E30 Kg. Also used in equations are: L = angular momentum of center of mass...
  12. C

    Does Formatting a Hard Drive Truly Erase All Data?

    I've been reading the thread on completely erasing hard drives as well as a bit on the File Allocation Table (i.e. FAT). Apparently formatting your computer does not completely erase your data from the disk. So I have some questions: 1) Does the FAT contain a collection of "pointers" to...
  13. S

    Computing tangent spaces of implicitly defined manifolds

    Hi there, Is there an "easy" way to find a tangent space at a specific point to an implicitly defined manifold? I am thinking of a manifold defined by all points x in R^k satisfying f(x) = c for some c in R^m. Sometimes I can find an explicit parametrization and compute the Jacobian matrix...
  14. M

    Ensemble average in quantum computing

    In the last step to get result from a quantum computer, measurement is required to collapse the quantum state. This can be done by the measuring a large ensemble average of same computed result. One realization I know is to use NMR to measure billions of spin. So, what is the minimum number of...
  15. L

    Basic parallelization technique for computing ensemble's average

    Hi there, as much of you i possesses a notebook (ubuntu) with DualCore processor. When i write my scientific simulation (C/C++ usually) i don't mind parallelizzation at all, that is, my program works on a single core only. I want to get benefit from dualcore technology without being crazy...
  16. O

    Understanding and Calculating Residues for 1/(1+z²+z⁴)

    Homework Statement computing the residue; 1/(1+z²+z⁴) Homework Equations Can someone explain to me what a residue is and how to calculate it! Is it simply the discontinuities of the function? The Attempt at a Solution
  17. B

    Surface Integrals: Computing Flux Through a Half Cylinder

    I'm working on an electrostatics problem that I'd appreciate some clarification on. I'm trying to compute the surface integral of a field \lambda(ix +jy) over a surface that is the half cylinder centered on the origin parallel to the x-axis - that is the end caps of the cylinder are located at...
  18. S

    Computing Atmospheric Trajectory of Meteor

    I'm trying to understand the mathematical methods of computing the atmospheric trajectory of a meteor for two or more stations. Ceplecha wrote a rather complete description of this in around 1987. See <http://adsabs.harvard.edu/abs/1987BAICz..38..222C>. Something of a simpler version meant for...
  19. S

    Laurent Series for f(z): Computing Contour Integral

    Homework Statement describe the laurent series for the function f(z) = z^3 cos(\frac {1}{z^2}) b) use your answer to part a to compute the contour integral \int z^3 cos(\frac {1}{z^2}) dz where C is the unit counter-clockwise circle around the origin.Homework Equations The Attempt at a...
  20. R

    Computing Hr and Hz from Magnetic potential

    Hello everybody, My question to you is how can I compute the values of Hr and Hz given the value of A - the magnetic vector potential. The reason I seek this: I'm using the FEMM software to obtain the H values at points around a solenoid. The .ans file that FEMM creates has a huge list of...
  21. C

    Compute Arccot of (-Sqr. Root(3)/3)

    Homework Statement compute arccot (-1/3 (3 in sqr. root)) Homework Equations The Attempt at a Solution Sorry for posting one so soon after, but this is really annoying me. I have looked through my trig book but i cannot remember what an arccot is. I know that there cannot be...
  22. H

    Computing expected number of particle collisions

    so i have a problem which can be formulated in the following way: assume you have n particles and you know the initial position of each. There is some probability distribution P which contains the probability of having a particular velocity. Now, each particle has this same probability...
  23. C

    Computing Sciences - An Art or a Science?

    Hello! I'm a few weeks away from being a high school senior, and I'm looking at going into Computing Sciences after high school. But when I checked out the website of the University I plan to attend, it listed Computing Science as both an Arts and a Sciences course. Why is this? Are there two...
  24. L

    Scientific Computing Jobs: Resources & Opportunities After BS

    I plan on finishing up a B.Sc. in math with a minor in physics in the next few years. Afterward I would like to get a job for a few years and then continue in graduate school learning more about scientific computing and the like. My question is what sorts of jobs are available in scientific...
  25. I

    A Question About Grover's Algorithm (Quantum Computing)

    Hey guys, After taking linear algebra I decided I could try my hand at learning some introductory QC algorithms, and downloading this introductory paper from arxiv: http://arxiv.org/abs/quant-ph/0301079v1 After mulling through it for a couple of days, I got a little disturbed by their...
  26. M

    Quantum Computing: Find People With Knowledge & Experience

    Who if anyone has a good knowledge base on this topic, I am really intreged to get on bored with a bunch of people with this topic as I want to study this at UNI, Anyone that has any skills, knowledge or experience working with such field post in here I am very basic when it comes to this but I...
  27. maverick280857

    Computing P$^{\mu}$ with Stress Energy Tensor

    Hi, I'm trying to compute P^{\mu} = \int d^{3}x T^{0\mu} where T is the stress energy tensor given by T^{\mu\nu} = \frac{\partial\mathcal{L}}{\partial[\partial_{\mu}\phi]}\partial^{\nu}\phi - g^{\mu\nu}\mathcal{L} for the scalar field \phi with the Lagrangian density given by \mathcal{L} =...
  28. T

    Computing Inner Products in C: Simplifying Complex Vector Calculations

    Homework Statement x=(2,1+i,i) and y=(2-i,2,1+2i) Homework Equations The Attempt at a Solution um ok normally i would use <a,b>=|a||b|cos(theta). But these are complex numbers. I have no clue how to do this.
  29. K

    Computing the Fourier Series for f(x)=x^2

    Homework Statement Compute the Fourier series for the given function f on the specified interval f(x) = x^2 on the interval − 1 < x < 1 The Attempt at a Solution Just wondering if anyone can verify my answer? f(x)=1/3+\sum(4/(n^2*pi^2)*(-1)^n*cos(n*pi*x))
  30. S

    Solve Hot-Wheels Car Mass, Velocity for Height

    Homework Statement "A hot-wheels car of mass 0.0250 kg is traveling on a horizontal track with a velocity of 5.00m/s. If the track suddenly turns upward, how high up the track can the car travel?" Homework Equations work = mgh = force * distance PEf + KEf = PEi + KEi KE = .5mv^2...
  31. Astronuc

    Consequences of bad numerical computing

    Some disasters attributable to bad numerical computing http://www.ima.umn.edu/~arnold/disasters/disasters.html That's why software QC/QA are critical - both in the code/method and in the implementation/application. And not to forget: Garbage in = Garbage out
  32. Topher925

    Distributed Computing, what projects do you belong to?

    Does anyone else here do distributed computing? I have my PCs running World Community Grid and work on the Clean Energy Project. Does anyone else participate?
  33. G

    Creating and computing functions

    for example: f(x) = x^(x^x) Firstly, is there already an inverse of this function that can be expressed in functions that exist? And if there isn't, how would I go about computing it in code? Is there a better way than trial and error?
  34. C

    Differential Equation computing solution

    Homework Statement Compute the general solution of y'' + 4y' + 20y =e-2tsin4t Homework Equations The Attempt at a Solution after using determinants, I found the \lambda_1 = -2 + 4i and \lambda_2 = -2 - 4i So the general solution would be y(t) = k1e-2tcos4t + k2e-2tsin4t + yim...
  35. T

    Brownian Motion Homework: Computing Probability & Expectation

    Homework Statement Let Bt be a standard Brownian motion. Let s<t: a) Compute P(\sigma B_{t}+\mu t|B_{s}=c) b) Compute E(B_{t}-t|B_{s}=c) Homework Equations Defition of brownian motion: B(t) is a (one-dim) brownian motion with variance \sigma^{2}if it satisfies the following conditions: (a)...
  36. E

    Sustainable Computing: Is it Practical for Everyone?

    How sustainable is computing? I spend several hours working on a computer each day and I am worried that this practice is not sustainable and/or not scalable to the entire world population. What do you guys think?
  37. T

    Study Quantum computing in Canada?

    Hi guys, I'm really interested in doing Grad study in the area of Quantum Computation (in Canadian U.). My background is B.Sc. in physics and Com Science and M.Sc in Com science. From my understanding, QC can be heavy in the field of physics for the HW part that they're trying to find a...
  38. M

    Computing the potential from the continuity equation

    Dear All, I need help on the following issue. Assuming the flow to be potential, I want to compute the potential given the density at all times, that is : From the continuity equation: \partial _t \rho + \nabla \cdot \left( {\rho \nabla \phi } \right) = 0 One can write down an...
  39. E

    Choice of computing platform for guidance system

    I am just starting to learn about attitude estimation and control of a flying(or actually, a freefalling) vehicle. There will be inputs from accelerometers and gyroscopes, Kalman filtering to estimate the correct attitude and control algorithm to achieve the desired attitude. I am still...
  40. E

    Did I Make a Mistake in Computing This Triple Integral?

    Homework Statement http://img19.imageshack.us/img19/5192/captureonr.th.jpg Can anyone tell me if I did any mis-computation on evaluating the triple integral above? Homework Equations The Attempt at a Solution
  41. clope023

    Computing derivatives/integrals of user-defined functions

    does anyone have ideas or easy to read versions of code for this? I was looking for ways to do it using the limit definition of a derivative of a function and I've found a few applets but nothing that is that clear; any ideas are appreciated.
  42. B

    Does anyone know about Quantum Computing?

    Just wondering if anyone on this forum has an extensive knowledge that they would like to share. I've heard that the basic concept in quantum computing has something to do with representing binary information with a variable 1 or 0. Something like that. I was trying to follow but it was very...
  43. D

    Need help with computing the volume of a solid by revolving lines

    Homework Statement the directions are: compute the volume of the solid formed by revolving the given region about the line region bounded by y=2x, y=2 and x=0 about (a) the y-axis; (b) x=1 Homework Equations V=∫A(x)dx,a,b The Attempt at a Solution From what my...
  44. N

    Proofs of fast formulas for computing constant pi

    I am interesting for mathematical background od fast algorithms for computing number \pi with complete proofs only. More specific, I am interesting for Gauss Legendre algorithm, Borwein algorithm, Ramanujan formulas and Chudnovsky formula.
  45. H

    Another problem involving computing area with integrals

    Homework Statement Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. x+y^2=6 x+y=0 Homework Equations none, just using integrals... The Attempt at a Solution I sketch the two curves and...
  46. H

    Problems computing area with integrals.

    Homework Statement Find the total area enclosed by the graphs of y=9x^2–x^3+x y=x^2+16x Homework Equations No real equations, just using integrals The Attempt at a Solution I graph the functions and find they intersect at 0 and 5, and that y=x^2+16x seems to be the upper...
  47. G

    Methods and complexity for computing square roots

    Hello everybody, Let's say we want to compute sqrt(x), where x is an integer of n digits. Then what is the cost of the computation, in terms of big O notation and n? And a second question: what is the algorithm for finding the square root that is most commonly used in computers and...
  48. F

    MATLAB Computing the area under a curve with Matlab

    how to find the area under the curve by using MATLAB i mean to say what is the command for this
  49. W

    Computing Normalisation Constant A

    Homework Statement Question: Given that Wavefunction Fi = A exp[b*mod(x)], which b is a non zero positive constant. Calculate the normalisation constant. Homework Equations 1 = Integrating Mod square (Wavefunction) from minus infinity to positive infinity The Attempt at a Solution...
  50. K

    FZERO or some method of computing the intercept points in MATLAB or Mathematica

    Homework Statement General problem--I don't know how to solve for the characteristic equation in MATLAB or Mathematica to find the solution of an equations such as Homework Equations cosh(x)*cos(x) = x (I know you can re-write this equation but it's just an example) The Attempt at a...
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