Computation Definition and 232 Threads

Dear All, I started to look around for a reliable definition of the differences between Calculation, Computation and Simulation, but I'm not satisfied with what I've found. In your view, what are the correct usages of these terms? When something becomes more than a computation or calculation...

I'm a bit confused about entanglement with regards to quantum computing. I'm not an expert by any means, but I've been reading around about quantum computing and was confused about something. I've read that, you can't directly observe a qubit, because if you do the wave function will collapse...

I'm looking at some code from a book that details uses the heliocentric position and velocity to compute an orbit of a meteor. See attached pages. At the top of the section at mid-page, page 37, he gives a source, Herget, 1953, Solar Coordinates 1800-2000. The book was written in the...

hi when i run a heavy computation on mathematica in the same time even if i want to calculate 2+2 , mathematica does not calculate it until calculating of heavy computation finishes. why? another problem is that when i do a heavy computation and obtain results , after closing mathematica...

Bonjour, I need to numerically compute the net electrical resistance of a given geometry. I know the shape of my object, it is relatively simple. It's close to this: http://2.imimg.com/data2/QX/UC/IMFCP-3019296/i-shape-big-1-250x250.jpg Actually my shape is even simpler because it's a...

I'm in 3rd year math, and out of the 11 courses I'm taking this year, 2 are computationally based (Calc III and Calc IV). I just finished my CalcIII midterm, I know i did fine, definitely a 90 or higher, but I just want to discuss how much I hate computation, and if anyone agrees with me. I'm...

Hi all, can you help me to compute these integrals? \int \frac{x \sqrt{a x+b+x^2}}{d^2+x^2} \, dx \int \frac{x}{\left(d^2+x^2\right) \sqrt{a x+b+x^2}} \, dx a,b and d are real and positive. I tried with Mathematica, but the results involve logarithmic functions with complex...

(1) Let s be a complex number like s = a + b i, then we define \zeta(s) = \sum_{n=1}^{\infty} \frac{1}{n^s} Our aim: to compute ζ(\frac{1}{2}+14.1347 i) with the help of the programming language Aribas (2) Web Links Aribas...

Hams and Raedt gave a quantum computational algorithm to calculate the density of states of a spin system. Starting with an initial random state, they obtain the time evolution of the state. Later they take the inner product of the evolved state with the initial state. How does the inner...

I want to basically have a dedicated machine for running scientific computation programs and be able to access it remotely anywhere using a laptop/netbook. That means I don’t care much about GUIs. I’m used to using Unix and am perfectly fine with doing everything through a command window. At the...

In this field, computer algorithms may produce false continued fraction expansions because of the limited accuracy in the floating point arithmetic used. Who knows more?

Good night, I want to study by myself Theory of Computation and its three main areas: Computational Complexity, Automata Theory and Computability. I find Algorithms and Algorithm Analysis to be specially interesting (although I don't know exactly where this topic fits). I am starting to...

I've written a Python program to simulate a meteor falling into the Earth's atmosphere. It's fairly straightforward. I give it the lat/long of two observing stations, and the lat/lng where the meteor begins along with an angle from north for the direction. An initial height above the beginning...

What is wrong with this computation ? (1) Mass of Earth's atmosphere is 5 x 10^18 Kg. (2) The heat capacity of dry air, Cp, is 1 KJ/Kg-K (3) BP states that the amount of fossil fuels burned worldwide in year 2008 was 11,295 million tons. Round that to 11 billion tons. (This may be...

Homework Statement Give state diagrams of DFAs recognizing the following languages. In all parts the alphabet is {0,1}. {w | w has length at least 3 and its third symbol is a 0} Homework Equations If the final state only has one circle it is rejected, if two, accepted. The Attempt at a...

Homework Statement Differential equations are important in physics.Consider Solving the differential equation dy/dx = Σ(from i to N) (ai) (x^i) Using Euler ,Midpoint ,4th order Runge -Kutta methods.For each of these methods what is the largest value of N that would lead to an exact solution ...

Homework Statement Homework Equations Fundamental theorem of calculus. The Attempt at a Solution For the first problem, I'm completely lost. I've only worked with slant asymptotes for polynomials so finding the domain, range and intercepts is as far as I've gotten. I'm not too...

Homework Statement x(t) = t*exp(a)*exp(-a*t)*u(t-1) - exp(a)*exp(-a*t)*u(t-1) I need to find X(jw)... Homework Equations how to apply properties of Fourier transform to get an answer? Because i know that the only effective method for this.. The Attempt at a Solution For...

Hello, I am a sixth form student studying physics and I am planning on doing a project on electronic analog computation and I am stuck as to where I should begin to learn how such a system solves problems (without delving too much into too many details). I have limited knowledge on electronics...

Hi, I want to calculate the angle of 6 point on a sphere. Five points are aranged in a cross, one point in the middle, and one on each side. All outer points are delta degrees distance from the center point. Define the axis going through the center point and the center of the sphere as X. The...

Hi all, This question has been intriguing me for a long time and now that I discovered this forum I thought it is a good place to ask. Take a typical CPU. To operate it draws energy from the power supply, does some computation and emits heat. Since state of energy can only be transformed...

Hello, I was wondering, if there is some good and easy to use computer programm, that, given a set of polynomials, tells me if they generate a radical ideal. Preferably as a Mathematica package.

The base of each solid below is the region in the xy-plane bounded by the x-axis, the graph of \[y=\sqrt{x}\] and the line x = 3. Find the volume of each solid. a) Each cross section is perpendicular to the y-axis is a square with one side in the xy-plane. b) Each cross section is...

Hey folks, I'm rather stuck. I have a complete mental blank on this question. Having the force couple first has confused me I think Homework Statement Compute the forece supported by the pin at C for the frame subjected to the 400-N.m couple Homework Equations...

The generating functional Z[J] depends on \phi_{cl} trough its dependence on J. At the lowest order in perturbation theory the relation between J(x) and \phi_{cl} is just the classical field equation: \left(\frac{\delta L}{\delta \phi}\right)_{\phi=\phi_{cl}} + J(x) = 0 The question is...

Ok it says I am to computer using a series accurate to within 0.001. I'm really not sure where to start. Do I integrate this first by parts? Or am I thinking about this too much? Could someone point me in the right direction please! Help would be much appreciated!

Hello, I am reading the book on algebraic topology by Fulton and the geometric intusion that is supposed to be given for homological group is the number of connected components. I wanted to understand an example. For a circle ( S1) which has got 2 points say A at ( 1, 0) and another...

hello,i had posted in this forum a question about linar algebra and quantum mechanics because i am studying quantum computation and information, i have the following book:"quantum computation and quantum information" by Michael A.Nielsen and Isaac L.Chuang. and i think it covers most topics of...

Homework Statement Say, i have a setup as shown on the photo below http://www.flickr.com/photos/47719498@N07/4375079183/ * setup also seen as attachment how can i be able to compute for the dielectric constant provided it is not parallel plate and considering two different area is...

I've the following problem. I have two four-vectors p and q where p is timelike ( p^{2} > 0 ) and q is spacelike( q^{2} < 0 ). Now I should consider the quantity - \dfrac{2 (pq)^{2} + p^{2} q^{2}}{q^{2}} and compute the limit q \to 0 . But I don't know how to perform the limit...

Hello, everyone. I've been reading this site off and on for a few weeks, and I'd like to ask you a few questions, if you don't mind. I'm a 30 year old software developer with a BS in computer science (and a mostly completed MS that I really regret not finishing). I generally enjoy my work...

Hello, I am quite new here, as my number of posts might indicate. Thus I am not really sure whether or not this question should be posted here or somewhere else. It is not a homework, but neither is it a question that could not be a homework. However, here we go. I have, during a course in...

Homework Statement A surface has the area vector A = 2i + 3j. What is the flux of a uniform electric field through it if the field is E = 4i? 2. Homework Equations Integral calculus, vectors The Attempt at a Solution I don't understand why one could do this. The integral is of E and...

Homework Statement Which of the following can be computed? 1. A dot B dot C 2. A dot ( B dot C ) 3. A dot ( B + C ) 4. 3 dot A Homework Equations The Attempt at a Solution I believe that 2 and 3 are the only two that can be computed. Can anyone confirm this? Thanks.

Hi, I'm having problem with understanding tensors and the Einsteins summation convention, so I decided to start doing explicit calculations, and I'm doing it in the wrong way. Hope someone could help me to clarify the concepts. In flat spacetime we have \eta with the signature (-+++). Under...

Hi, I was wondering if there exists an algorithm for one by one digit computation of an integer to the power of any real number? Couldn't find anything on the net.

I was exploring the connection between the Laplace transform and the Fourier transform (see "=http://earthcubed.wordpress.com/2009/08/30/using-the-fft-to-calculate-the-laplace-transform/"[/URL])and it occurred to me that the from the definition of the Laplace transform: F(s) = \mathcal{L}...

Hi, I need to get a simplified equation by setting the determinant of the following expression to zero: exp(j.omega.dt). [I] - [G] Here, I is an 18x18 identity matrix and G is an 18x18 matrix that I got by doing some symbolic computation in Mathematica (in fact G is huge). Can anyone...

Homework Statement I am given a one form Psi = zdx -xydy and two vectors v(1,1,-2) and w(-2,1,1) both tangent vectors of R3 at point P(2,-1,0). I am asked to find dPsi(v,w). Homework Equations Lie bracket? The Attempt at a Solution I know how to computer Psi(v) at p but this...

Hi All, from this page (Cylindrical Capacitor) => http://www.phys.uri.edu/~gerhard/PHY204/tsl105.pdf What happens when L is <= b? Does the computation change? and from this page http://www.physics.umd.edu/perg/abp/TPProbs/Problems/E/E52.htm The capacitor is simplified to a plane...

I have 2 questions about quantum computation that I find interesting. 1. I understand that because the qubits are in a superposition and therefore do not have defined values that they perform all the possible calculations at once therefore making it the most powerful and parallel processor...

To what extent is computation used in nuclear reactor design? For example in aerospace CFD and FEM softwares are frequently used in the design process; the days of wind tunnel testing is limited to its absolute minimum. What are major softwares used in NE? Are there softwares such as NX, that...

I have a problem with DNA computation that is currently being researched. Currently all the research is being done because cells are so parallel but how is that even useful. I keep thinking if you have this so called cell computer calculate every possible addition problem possible for a 32 bit...

What are 10 big programs that are used today(in industry) for computation and modeling of physical sciences, specifically physics.

I hope to pursue a research career in Quantum computation. Could anyone suggest some good universities in UK where active research is going on in this field?Any information is most welcome.

A qubit state can be represented geometrically by Bloch sphere. A Bloch sphere has infinite points and so a single qubit can represent infinite number of states. Qubit state is represented by, Ipsi> = cos(theta/2)I0> + exp(i(phi))sin(theta/2)I1> It is said in the Book on Quantum...

What graduate schools are the best if I want to pursue research in Quantum Computation? I know MIT has a good program and I am going to apply there but what other schools would you recommend? I would prefer to stay on this side of the Atlantic.

Hi, I'm new graduate student and I need to know what is the quantum computation about? My second question is the same as above for "particles physics". is anyone to help me? thanks

u,w are scalar functions of 3 variables the book says you can verify by direct computation: u\nabla^{2}w = \nabla \bullet\left(u\nabla w\right) - \left(\nabla u\right)\bullet\left(\nabla w \right) and \nabla^{2}w is \Delta w, the Laplacian operator. Every time I've worked this, I just can't...

Hello, I'm in my last year of a B.Sc with a double major in math and physics. I was somewhat interested in becoming an actuary, and was discussing it with a friend of mine when he brought up computational finance as an alternative. I did some 'googling' about it, and i seems pretty...