Computing Definition and 731 Threads

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. 1

    Computing Cherenkov angle when only knowing n?

    Homework Statement If all we know is that the media is 1.001, how can we compute the Cherenkov angle and threshold momentum of electrons,muons, pions, and kaons?Homework Equations I know that cos(theta_c) = 1/beta*n, where beta = v_p/c and n=c/v_em, where v_p is the particle velocity and v_em...
  2. K

    Computing an integral -- any method

    Hi, I have been trying to find an integral ## \int_{-\infty}^{+\infty} \frac{ e^{-\sqrt{(x^2 + 1)}}}{(x^2 + 1)^2} dx ##. I initially posted this question in the complex analysis forum since I felt it might be done using contour integration. However now I realize it might not be the best way...
  3. K

    2nd order pole while computing residue in a complex integral

    Hello, I am trying to understand how to get the residue as given by wolfram : http://www.wolframalpha.com/input/?i=residue+of+e^{Sqrt[x^2+%2B+1]}%2F%28x^2+%2B+1%29^2 The issue I am facing is - since it is a second order pole, when I try to different e^{\sqrt{x^+1}} I get a \sqrt{x^+1}...
  4. bcrowell

    Computing trajectories in Schwarzschild spacetime

    I want to produce some realistic figures showing the spatial trajectories of test particles in a Schwarzschild spacetime. For instance, I'd like to start a massive test particle at aponegricon (how often do you get to use that word!?) in an orbit that Kepler and Newton would have predicted to be...
  5. W

    Boosting PC Performance: Which Services Impact Restore Points?

    Hi, I am in the process of deleting some services ( or at least stopping them from being loaded upon starting up), but I don't want to delete my restore points. Which services will have the effect that their removal will delete restore points? WWGD: What Would Gauss Do? ( If he knew about...
  6. M

    Python Python, solving Schrodinger equation using Runge-Kutta

    Homework Statement I'm currently working on a project in which I have to solve the energy eigenvalues of the Schrodinger equation to compute the mass of certain Mesons. We've been taught very little programming (so apologies that my understanding is very basic), and are therefore given any...
  7. K

    How do I build this crystal structure in computing programs?

    It's Ti2Ni, which is in FD-3M spacegroup. I have its .cif file which can be loaded by many crystal building program. So I try to build the structure according to the loaded images. I started building a structure with FD-3M lattice. But when I tried to add atoms at the position read from the...
  8. E

    'Information' in computing vs. physical information

    Hey everyone. I'm sorry if I'm posting something irrelevant here. I really don't know where to ask this question but this hit me while learning Computing Principles (It's my first day in college). I'm one who is interested in physics too. Hence, I got a little confused about the term...
  9. S

    Meteor trajectories -- Interested in computing them?

    Is anyone in this forum interested in computing meteor trajectories?
  10. T

    Computing max tensile and compressive stress in a bar

    Homework Statement I've used all the proper equations and done all the work with no problem. My only question is when computing the maximum stress, how do I know which one is the tensile and which on is the compressive? I've attached all my work and came out with Max stress = 3.84 Mpa and Max...
  11. xortdsc

    Computing Curvature of Space at Point from Mass - Help Needed

    Hello, given a stationary pointlike particle with mass m at some position, I'm trying to compute just how much space is curved/deformed at a distance r from that particle due to its gravitational field. I'm not really into all that tensor calculus, so I really struggle with the equations given...
  12. M

    Superscalar CPUs and Quantum computing

    So, from what I understand, modern computers use superscalar CPUs which allows the computer to run two instructions on two separate lines of data in parallel. Which in lame man's terms is just: the CPU can run two instructions at the same time. Now, from what I understand, this is also a...
  13. goonking

    Solve Derivative of y = x2sinx

    Homework Statement y = x 2sinx Homework EquationsThe Attempt at a Solution Ok, so If I see an x in an exponent, I would want to use ln to 'bring it out', right? ln y = ln (x 2sinx) = ln x + ln 2sinx = ln x + sinx ln2 now I take the derivative : y'/y = 1/x + cosx ln2 multiply both sides...
  14. goonking

    Computing derivative (basic calculus question)

    Homework Statement Compute Derivative y = xx + sin(x) Homework EquationsThe Attempt at a Solution since I have x in the exponent (x^x), I multiply both sides by ln: ln y = ln xx + ln sin(x) the x in the exponent comes out into the front, right? y'/y = x ln x + ln sin (x) using product...
  15. L

    Computing tools for social studies documents

    Maybe it is not that specific to social studies when one is talking about document computing tools (which I refer to content-related tools here, e.g. Charting, Visualising, Flowcharting, and Infographing tools, etc), but I really am curious about what specific tools are social studies...
  16. Alexi-dono

    Creating a Language for an Optical Computing System

    lets say someone had an idea for a fully optical computer; that had a optical cubic processor, that refracted and reflected signals. into a optical "motherboard" (except it was not a flat board, more of a rectangle), how would one go about writing a language for such a thing (lets say a base 8...
  17. R

    Civil vs Mechanical vs Computing

    There are probably numerous threads like this, I have read them all but I'm still undecided. I am a high school senior and applying to UK universities - I have applied to more than one subject (three, actually: civil, mechanical engineering and computing, all from Imperial College) and received...
  18. Math Amateur

    MHB Computing a Simple Integral Via Riemann Sums

    I am reading Manfred Stoll's book: Introduction to Real Analysis. I need help with Exercise 2(a) from Stoll's Exercises 6.2 on page 229 ... Exercise 2 reads as follows: I was somewhat puzzled about how to do this exercise ... BUT ... even more puzzled when I read Stoll's hint for solving the...
  19. E

    Exploring Qubit Computing: Manipulating 3 Electrons in Superposition

    I'd like an actual example of qbits operations. Supposed we have 3 electrons in superposition of spin up and spin down.. then we have total of 2^3 or 8 combinations of information. Can you give an example of how to manipulate the 8 combinations using classical computer and quantum computer? I...
  20. P

    Python Need Help Learning Python Quickly?

    Do anyone know of a good detailed book or website that would help me learn Python quickly? I have assignments that must be done in Python for one of my physics courses. I'm supposed to know how to do it since last semester but had a greater deal of trouble picking up on it and didn't have much...
  21. E

    Books on quantum computing, qbits

    please share the best clearest introductory books or articles (like from sci-am or discover magazine with colorful illustrations)) on quantum computing (or quantum computers) like how they are implemented in the hardware. I see thousands of examples of quantum entanglements in books, magazine...
  22. Y

    How do I compute jerk in 2D space for a mouse tracking task?

    Hi everyone, I am a graduate student in psychology and am working on a research project where I am trying to derive the kinematics of a mouse tracking task. I am currently writing a MATLAB script to do this, and I believe my equations for velocity and acceleration are correct, but I have very...
  23. T

    Quantum Computing with Zero Spin Atoms?

    Hello, Is it possible to build a qubit from an atom with a nuclear spin of zero (ie. 16O, 12C, 32S)? Would it depend on electron spin instead? Thanks!
  24. C

    What is trivial and non-trivial gate in computing?

    My question seems like it should be posted in Computer Engineering section, but below is how I found this word. I was reading the textbook: Quantum Computation And Quantum Information - by Michael A. Nielsen and Issac L. Chuang. and I came across with the this word; "1.3.1 Single qubit gates...
  25. M

    Topology required for topological quantum computing?

    I guess the usual answer would be to learn as much as possible. Some background about me: I am not a physicist but I'd like to pursue a PhD in theoretical physics (after a year or two) and work on topological quantum computing. I am familiar with quantum mechanics and solid state physics (at...
  26. David Carroll

    Why is this way of computing imaginary arctangents wrong?

    I was doing some things in my head the other day (these moments usually don't come out so well :rolleyes:). And I "came up" with the following way to compute the arctangent with imaginary arguments. Consider the identity x2 = - 2, where x = ± i√2. Now rearrange this identity to x2 + 1 = -1...
  27. C

    How to Compute an Integral Using FORTRAN?

    I have a question set for programming to compute integral for the following unknown function using composite rectangle method, trapezoidal rule and simpsons rule. \int_{0}^{1.8} f(x) dx for h=0.3 and h=0.4 I have a table of results for f(x) and x as follows x=0, 0.3, 0.6, 0.9, 0.12, 0.15...
  28. andyrk

    Computing a Series Sum: n2 + (r-1)2 to n2 + (n-1)2

    Can someone explain how to compute the sum of the following series? 1/(n2 + (r-1)2) + 1/(n2 + (r)2) + 1/(n2 + (r+1)2) + ...1/(n2 + (n-1)2)
  29. evinda

    MHB Computing Binary Tree Sums without Globals/Statics

    Hi! (Wave) I want to write an algorithm, that counts the sum of the keys of the nodes of a binary tree, without the use of globals and statics. That's what I have tried: S(NODE *P){ if (P==NULL) return 0; int m=P->data+S(P->left); int n=m+S(P->right); return n; Could you tell me if it...
  30. P

    Help with classes to get into Quantum Computing

    Hi I am an undergrad student in an Electrical engineering program and going for my masters and undergrad degree at the same time (special program i am in). I an very interested on the hardware side of quantum computing as to have a future career in this field (eventually will go for a PhD). I...
  31. Julio1

    MHB Computing the Limit of a Power Series

    Compute $\displaystyle\lim_{n\to +\infty}\dfrac{1^p+2^p+3^p+\cdots +n^p}{n^{p+1}}.$
  32. \Theta

    Intro to Java book for scientific computing?

    Hey everybody, I need to learn Java for a course I'm taking in the spring(my C++ course fulfills the prereq for our java intro to data structures course) and I need to get a working knowledge of java. I've been reading the book for the class I'm not taking, but it's essentially built around a...
  33. S

    MHB What is the role of $$\hat{\jmath} \times r$$ in computing vorticity?

    A fluid motion has velocity $$\underline{u}=\sin{(at)}\hat{\imath}+\hat{\jmath} \times r +\cos{(at)}\hat{k}$$ I need to know what is $$\hat{\jmath} \times r$$ to find Vorticity and other things.
  34. J

    How Do You Calculate the Magnitude of a 4-Vector?

    Hello there, Given any 4-vector ##x = (x_0,x_1,x_2,x_3)##, hvor do I compute its magnitude? I couldn't find a simple explanation online. For example I want to compute the magnitute of the momenergy 4-vector of a photon traveling in the positive x-direction where ##E## is the energy of the...
  35. homer

    How Do You Compute the Complex Gaussian Integral I = ∫ e^(-ax^2 + ibx) dx?

    Homework Statement Let a,b be real with a > 0. Compute the integral I = \int_{-\infty}^{\infty} e^{-ax^2 + ibx}\,dx. Homework Equations Equation (1): \int_{-\infty}^{\infty} e^{-x^2}\,dx = \sqrt{\pi} Equation (2): -ax^2 + ibx = -a\Big(x - \frac{ib}{2a}\Big)^2 - \frac{b^2}{4a}The Attempt...
  36. M

    Quantum Computing: Difference vs Normal Computers

    Hi i just wanted to know what the main difference between quantum computers and normal computers are? Is it that a Qubit can be 1 and 0 at the same time... becaus that is what i found after i researched however my friend states that the quantum computer can run many different sets of code at...
  37. B

    Computing Eigenvectors of Matrix H with Wolfram

    Homework Statement Compute, using wolfram is an option, eitH where H is: ##H = \begin{pmatrix} 0 & -1 & 0 & 0 & 0& 0\\ -1 & 0 & -1 & 0 & 0& 0\\ 0 & -1 & 0 & -1 & 0& 0\\ 0 & 0 & -1 & 0 & -1& 0\\ 0 & 0 & 0 & -1 & 0& -1\\ 0 & 0 & 0 & 0 & -1& 0\\ \end{pmatrix}## Homework...
  38. X

    MATLAB Matlab vs Mathematica for computing derivatives

    I'm trying to do a calculation which involves taking the derivative of a term that is millions of terms long. I'm using a supercomputer right now with Mathematica to do it but it's taking to long. Does Matlab have a faster algorithm for computing derivatives analytically?
  39. Jay1

    MHB Computing The Arbitrary-Precision Value Of N-Factorial In PHP

    The general integer factorial can be expressed by the equation: $$N! = \prod_{x~=~1}^N {x} = {1 \cdot 2 \cdot 3 \cdot ~~...~~ \cdot N}$$ This simply means that N-factorial is the sequential product of all integers from 1 to N. Below is a simple PHP function to compute the arbitrary-precision...
  40. Jay1

    MHB Computing The Arbitrary-Precision Nth Root Of Positive (X) In PHP

    PHP has some powerful arbitrary-precision (BC or binary calculator) arithmetic functions which seem to be greatly underused and only consist of the basic arithmetic operations, a square root function, a mod function and an integer power function. However, those basic operations can be used to...
  41. S

    Why does this algorithm (about computing a^n) work?

    Homework Statement Here is the algorithm (which works perfectly) for computing a^n for any integer a and a nonnegative integer n in Pascal-style pseudocode.: k := n; b := 1; c:= a; {a^n = b * (c^k)} while k <> 0 do begin if k mod 2 = 0 then begin k := k div 2; c := c...
  42. gfd43tg

    Computing integral using Monte Carlo method

    Homework Statement Complete the following MATLAB function that computes the integral ##\int_{-2}^{5} f(x)dx## of the function ##f(x)## plotted in the figure below, after N trials using a Monte Carlo method. Take all the required numerical inputs from the figure shown below. Hint: Generate a...
  43. epenguin

    Computing graduates deemed unemployable

    We often get questions here on the lines 'I'm really passionate about physics/philosophy/xyz but I/my parents think the jobs are in computing/engineering/medicine/uvw what should I do? Most often the advice is do what you're really interested in The other day in 'The Times' (UK) was an...
  44. \Theta

    Scientific Computing Application Area?

    Hi everyone! I have a question for you all. I'm a 3rd year undergraduate math student who took 4 years away from school and I'm going to be returning this Fall(^.^). Prior to leaving school, I'd take courses in C++, Numerical Methods, Two additional semesters of Numerical Analysis, Modern...
  45. vead

    What is embedded computing system

    I don't understand what is meaning of embedded computing system design embedded system is combination of hardware and software that perform some specific task does embedded system and embedded computing system is different things ? Q what is embedded system design process ?
  46. G

    Computing Čech cohomology groups

    I'm trying to understand Čech cohomology and for this I'm looking at the example of ##S^1## defined as ##[0,1]/\sim## with ##0 \sim 1##. To compute everything, I have the cover ##\mathcal U## consisting of the sets $$U_0= (0, 2/3) \, , \, U_1= (1/3, 1) \, , \, U_2= (2/3, 1] \cup [0, 1/3)$$...
  47. S

    MATLAB Computing normalized oscillator states for very large N (Matlab)

    Hi everyone, I have a rather fundamental question about building oscillator wavefunctions numerically. I'm using Matlab. Since it's 1/√(2nn!∏)*exp(-x2/2)*Hn(x), the normalization term tends to zero rapidly. So for very large N (N>=152 in Matlab) it is zero to machine precision! Though asymptotic...
  48. M

    Computing geodesic distances from structural data

    Greetings, I am attempting to compute geodesic distances on manifolds where structural data have been sparsely sampled. First, off I am not well versed in the mathematics of differential geometry but I do have some knowledge (from an introductory differential geometry class in my...
  49. 1

    Something that puts everything into quantum computing

    i can not say that I'm super good at knowing my quantum physics, but i know enough, and even if i don't i can just search it up! so, recently i have taken an interest into the quantum computer , and the theories of how it works, is there anywhere that talks about it?
  50. B

    Use of ancillary bits in quantum computing

    How is an ancillary bit used in a logic gate? I looked at http://en.wikipedia.org/wiki/Ancilla_(quantum_computing ) as well as Quantum Computation and Quantum Information by Nielsen and Chuang, but neither source really explained how an ancillary bit is used (in a logic gate circuit) or...
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