What is Method: Definition and 1000 Discussions

In mathematics and computational science, the Euler method (also called forward Euler method) is a first-order numerical procedure for solving ordinary differential equations (ODEs) with a given initial value. It is the most basic explicit method for numerical integration of ordinary differential equations and is the simplest Runge–Kutta method. The Euler method is named after Leonhard Euler, who treated it in his book Institutionum calculi integralis (published 1768–1870).The Euler method is a first-order method, which means that the local error (error per step) is proportional to the square of the step size, and the global error (error at a given time) is proportional to the step size.
The Euler method often serves as the basis to construct more complex methods, e.g., predictor–corrector method.

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  1. W

    A predictor-corrector method and stability

    A predictor-corrector method for the approximate solution of y'=f(t,y) uses \begin{equation} y_{n+1}-y_{n}=hf_{n} \tag P \end{equation} as predictor and \begin{equation} y_{n+1}-y_{n}=\frac{h}{2}(f_{n+1}-f_{n}) \tag C \end{equation} IF (P) and (C) are used in PECE mode on the...
  2. R

    MHB A predictor-corrector method and stability

    A predictor-corrector method for the approximate solution of $y'=f(t,y)$ uses \begin{equation} y_{n+1}-y_{n}=hf_{n} \tag P \end{equation} as predictor and \begin{equation} y_{n+1}-y_{n}=\frac{h}{2}(f_{n+1}-f_{n}) \tag C \end{equation} IF $(P)$ and $(C)$ are used in PECE mode on the...
  3. T

    Rack and pinion, motor selection method

    Hi! I'm stuck on a very basic problem while trying to design a product. Basically, I need to know how to calculate the gear ratios, pitch, motor specs etc for two rack and pinion mechanisms- one horizontal and one vertical. The pinion moves along the rack in both situations. Mass to be moved-...
  4. D

    Hybrid Method for Solving linear equations

    Homework Statement What Hybrid Methods are used for solving linear equations and how are they advantageous to classic methods? Homework Equations The Attempt at a Solution Well I assume that more robust methods such as bisection would be combined with Newtons or secant which are...
  5. D

    Successive Substitution vs Newton's Method

    Homework Statement Name disadvantages of the Successive Method vs Newtons for solving nonlinear equations? Homework Equations The Attempt at a Solution I went all through the textbook and this is all I could find on the successive method disadvantages but these are not compared to...
  6. E

    MHB Solving Equivalent Expressions Using Subtraction Method

    How do you determine if the two expressions are equivalent using the subtraction method?\frac{2x^3+7x^2-5x-6}{x+1} - [(2x^2+5x-10) + \frac{4}{x+1}] The textbook says that they're equivalent. I know that, using the subtraction method, they have to equal 0 in order to be equivalent. But, I'm not...
  7. E

    A problem in sections method in analyzing structure

    Homework Statement Determine the force in members BF, BG, and AB, and state if the members are in tension or compression. Homework Equations Method of sections The Attempt at a Solution Now I cut the sections FB, BG and BA... I took the lower end. I now have three unknowns. I...
  8. I

    Simplex Method, Duality Problem

    Hello everyone, I have the following question: Show without using the simplex method that x1=5/26, x2=5/2, x3=27/26 is an optimal solution to the following LPP. Maximize z=9x1+14x2+7x3 subject to 2x1+x2+3x3<= 6 5x1+4x2+x3<= 12 12x2 <= 5 x1,x2,x3 unrestricted...
  9. R

    MHB Harmonic oscillator and symplectic Euler method

    Given the equations for the harmonic oscillator $\frac{dy}{dz}=z, \frac{dz}{dt}= -y$if the system is approximated by the symplectic Euler method, then it gives$z_{n+1}= z_{n}-hy_{n}, \\ y_{n+1}= y_{n}+hz_{n+1}$which shows that the circle $y^2_{n} + z^2_{n} = 1$ is mapped into an ellipse...
  10. R

    When determining if a decay is possible, is there a method to use?

    Hi, I'm in the process of revision for upcoming exams, one likely question will give a number of decays (~5) and ask if they are possible. I understand baryon number, lepton number (and parity, isospin, and strangeness) must be conserved, but for example for the following: K+ -> neutral...
  11. Q

    What would be the best method for heating copper tubing via nichrome?

    What would be the best method for heating copper tubing via nichrome wire? Voltage is 10
  12. E

    Four Wave mixing and split step Fourier method

    Hello everyone . I need to ask if I want to get the right units for each parameter to be able to get the right results Can anyone define them properly? Like the gamma the initial power of pump or signal dispersion and non linear factors Thank you
  13. PsychonautQQ

    Differential Equations Method of Undetermined Coefficients

    Homework Statement consider y'' + 2y' - 3y = 1 + xe^x, find the particular solution The Attempt at a Solution so f(x) = 1 + xe^x f'(x) =e^x + xe^x f''(x) = 2e^x + xe^x so it looks like my particular solution is going to have a constant term, an e^x term and an xe^x term, so I can...
  14. S

    Gnuplot: x squared minimization method

    Hello, I am using the x squared minimization method to compute two parametres in a function let's say (A,B) which correspondes to the minimum value of x^2. Now if i want to make a contour plot of A,B (A=x axis and B=y axis) for the values of x^2-x^2_(minimum)=1σ=2.3 what is the proper way...
  15. binbagsss

    Magnetic field calculation. Method of Images/superimposition.

    The question is : A cable of circular cross-section and diameter 2 cm has a long cylindrical hole of diameter 1 mm drilled in it parallel to the cable axis. The distance between the axis of the hole and the cable is 5 mm. If the cable has a uniform steady current density of J=10 5 Am-2...
  16. D

    Solving trusses with the Direct Stiffness Method

    I'm creating a computer implementation to solve planar trusses. And I'm not sure how to check if the truss is solvable or not. Can you help me with that? In my implementation, the trusses are created randomly (needs to be this way), so i get a lot of unstable or indeterminate trusses. I want...
  17. O

    MHB Proving Exponential Decay of Solution u_t w/o Poincaré Inequality

    I tried solving this problem, i uploaded how far I went. please correct if I am wrong Let u be the solution of the equation u_t (x,t) - Kuxx (x,t) + ku(x,t) = 0; 0 < x < ℓ; t > 0; under zero-flux boundary conditions and the initial condition u(x,0) = a(x). Prove that ∥u(,t)∥ decays...
  18. H

    Shooting Method to solve Blasius equation

    Hello all, I'm trying to write a bit of Matlab to solve the Blasius Equation f*f'' + f''' = 0, where at eta = 0, f' = 0, and at eta = infinity, f' = 1. What I have so far is below...I'm a bit rusty. Two specific questions: 1. I'm trying to drive y2 to the b.c. of 1, however my loop...
  19. zthompson47

    Double slit experimental method

    Hello, I've been trying to learn physics recently with the long term goal of understanding GR and cosmology. As a result, I have many questions, so I'll just get started.. In the famous double slit experiment, there is a coherent light source aimed at a double slit which produces an...
  20. E

    Method 2 make burst then short circuit

    Hi All, I am trying to make a system which supplies a large burst mode AC signal to a piezo and then short circuits the terminals once the burst is over( here in the literature). The system has a Function Generator attached to a High Power amplifier which is attached to the leads of the...
  21. L

    Finding a derivative through the limit method

    Homework Statement Hi, I'm trying to understand how you solve for the problem lim [(2+h)^5 -2^5]/h as h→0 I already have the solution, but I want to make sure my understanding of how it's done is correct. Homework Equations I'm suppose to be using the definition of the derivative...
  22. J

    Calculus Definite Integrals: Volumes by Washer Method

    Homework Statement Using Washer Method: Revolve region R bounded by y=x^2 and y=x^.5 about y=-3 Homework Equations V= integral of A(x) from a to b with respect to a variable "x" A(x)=pi*radius^2 The Attempt at a Solution pi(integral of (x^.5-3)^2 -(x^2)^2-3) from 0 to 1 with...
  23. F

    Finite element method and applied element method

    What are the advantages and disadvantages of both AEM and FEM and which on is easier. I am doing a project and I should use one of these two methods to solve for a truss system. P.S. computer programming shall be used. In the end which method is better for this case?
  24. Z

    Sign confusion when taking gradient (Newton's Method)

    I'm watching a lecture on Newton's method with n-dimensions but I am kind of hung up on why the professor did not use the negative sign while taking the first gradient? Is there a rule that explains this or something that I'm forgetting? The rest makes sense but highlighted in red is the part I...
  25. MarkFL

    MHB Kim's Questions on Babylonian Method for Estimating Square Roots

    Here are the questions: I have posted a link there to this thread so the OP can view my work.
  26. Z

    Sign confusion when taking gradient (Newton's Method)

    I'm watching a lecture on Newton's method with n-dimensions but I am kind of hung up on why the professor did not use the negative sign while taking the first gradient? Is there a rule that explains this or something that I'm forgetting? The rest makes sense but highlighted in red is the part I...
  27. D

    Virtual Work Method on a Truss

    Homework Statement I want to calculate the horizontal deflections at joints A and F (using Virtual Work method taught in Structural Engineering). Cross-Sectional Area (A) and E values are provided in the problem, and the attachment has all relevant dimensions and applied loads.Homework...
  28. V

    Uncertanty in a non-linear regression with least squares method

    Homework Statement Ok, so I'm trying to fit a set of data (21000 points to be exact) to a sine function. Homework Equations Y = A*sin(ωt) The Attempt at a Solution I used NumPy to get the parameters A and ω with the least squares method. So far, so good. However, i appear to...
  29. A

    Numerical method to solve a spring system

    Hello everyone, this is my first thread in this comunity. I explain my problem: I have a triangle mesh http://en.wikipedia.org/wiki/Triangle_mesh where at every vertex coincide a mass element and on every edge I add a spring. I would like simulate a deformation model. My idea derive...
  30. M

    C-G coefficients by matrix method

    How to find the Glebsch Gordan coefficients by matrix form. Let's suppose we have a two spin 1/2 particles, we get that (check attachment 1). These are the corresponding coefficients the classic way. Now if I want find them the matrix way, where the matrix should be diagonalized. How do I...
  31. rsyed5

    MHB How can the lower rectangle method for area approximation be improved?

    Hi, Can someone suggest a way to improve the lower rectangle method for area approximation...? I know one way is to increase the number of rectangles so if I put 100 instead of 5 rectangles i will get a better approximation. Another way it could be improved...?
  32. S

    Derivative Method for Error in Kinetic Energy formula

    Homework Statement Finding error in kinetic energyHomework Equations K = \frac{1}{2} m v2The Attempt at a Solution Measured mass and velocities have errors in them. So we have to use derivative method to calculate uncertainty in KE which is to find the square root of the derivatives of K...
  33. S

    Intraclass Correlation Coefficient (ICC) the appropriate method?

    Homework Statement I wish to determine whether a SINGLE instrument provides reliable measures (test-retest reliability). This single instrument is not random (it's the only one available), and I will take 10 measurements for each individual that is part of a control group (and then again for...
  34. E

    How Does the Raman Effect Impact SSFM in Nonlinear Fiber Optics?

    Hello everyone I am doing my own split step Fourier method (SSFM)code on Matlab to solve the Nonlinear schrodinger equation in nonlinear fiber optics My problem is that in the Nonlinear operator we just multiply it with the initial pulse during SSFM without doing any Fourier transform not...
  35. T

    Alternative to Von Neumann bias correction method

    Hi I have discovered that the Von Neumann bias correction method only works when the bias is 100% stable, for example tossing the same loaded coin again and again. Does anyone know of a bias correction method which can correct an unstable bias? Is this impossible? Edit: Let's say I have a...
  36. F

    Particle Mesh Method - FFT with Green Function

    Hello, For generating initial velocities on a N-Body code (modeling galaxy dynamics), I need to solve the Poisson equation with Green's function by applying Fast Fourier Transform. The Fourier analysis being more straightforwardly performed in a periodic system, I use the "zero padding trick"...
  37. M

    Method for unique collisions between 2 subdivided ellipses

    Hello, I would like find a way to figure out how many unique collision there are between 2 equally subdivided ellipsoids (velocity=1). When you have 2 ellipsoids and you let them collide than you have an infinite amount of possible outcomes. The goal is to reduce this infinite number to...
  38. A

    Frobenius Method: Solving for General Solution of 4xy'' + 2y' + y = 0 [x7/2]

    ∑Homework Statement Use the method of Frobenius, constructing a power series about x = 0, to find the general solution of this equation (retain terms up to and including those in square brackets): 4xy'' + 2y' + y = 0 [x7/2] Note: the solution can be written in closed form, can you...
  39. H

    Component method for vectors

    Homework Statement Use the componant method to determine the total displacement given by the two vectors shown in each diagram. Homework Equations The Attempt at a Solution I thought I just had to find the third unknown side, and use the pythagorean theorem, but I was...
  40. Y

    Solve Mass Suspension by Component Method

    Homework Statement A mass of 100 kg is suspended by two ropes that make an angle of 60 degrees to the horizontal. If a horizontal pull of 200N, in a plane perpendicular to the plane of the other forces is applied find the tensions in the ropes after equilibrium has occurred. Homework...
  41. polygamma

    MHB Evaluating an Integral: Laplace Transform Method

    The typical way to evaluate $ \displaystyle \int_{0}^{\infty} \frac{\cos mx}{a^{2}+x^{2}} \ dx$ is by contour integration. In a recent thread I evaluated that integral using the Laplace transform. http://mathhelpboards.com/analysis-50/advanced-integration-problem-9129.html#post42551My...
  42. S

    Reactions of a redundant frame structure using Unit Load Method

    Homework Statement Hi, I am having trouble with the following problem and I can't seem to find any examples: I am trying to determine reactions at points A and D of the redundant structure below using the unit load method, there is a 10kN load at the top left point (B), all lengths are...
  43. Z

    Node-voltage method to find current

    Homework Statement Use the node-voltage method to find i_0 in the figure (Figure 1) if v = 29.0V. Homework Equations G = 1/R \sumG connected to node 1 * v_1 - \sumG between node 1 and 2 * v_2 = Current source into node 1 \sumG connected to node 2 * v_2 - \sumG between node 1...
  44. S

    Forward Euler Method for ODE system

    Homework Statement Solve the following system for 0<t<5 u^\prime = u-e^{-2t} v, u(0) = 1 v^\prime = u+3v, v(0) = -2 using Forward Euler method and implement the numerical scheme into a MATLAB code. Homework Equations Forward Euler : \vec x^(\prime)_{n+1} = \vec F(t,\vec x)...
  45. R

    Simple Probability decoding a message (need clarification about method

    Homework Statement Three people work independently at deciphering a message sent in code. the respective probabilities are persion a: 1/6 person b: 1/8 person c: 2/7 what is the probability that the message will be decoded Homework Equations (A or B ) = Pr(A) + Pr(b) - Pr(A...
  46. M

    Finite Volume Method & Evaluating Integral at Borders for Two-Phase Flow

    Hi! I am trying to make a one-dimentional simulator for two-phase flow. I am going to use the finite volume method, because it is conservative and thus it's easier to keep track of the oil/water ratio in the area. Say you have a conservation equation on the form \nabla \cdot (k(x) \nabla P(x))...
  47. N

    Digital signal processing - Pseudo Inverse Method

    Digital signal processing -- Pseudo Inverse Method Homework Statement The Attempt at a Solution (a) A =the matrix with [ .4 0 0 0 0 0 0 0 0 0 0 0; .7 .4 0 0 0 0 0 0 0 0 0; -.1 .7 .4 0 0 0 0 0 0 0 0;... all the way down to 0 0 0 0 0 0 0 0 0 0 -.1] so it is 11 x9 . w=[w0 w1 ... w8]'...
  48. 7

    MHB Determining the appropriate analysis method

    So here's the deal. I'm a human factors major and because I had a single stats class I am required to have a statistical analysis in my thesis. With that said it was a few years ago and wasn't my strong suit anyway. Here is what I am trying to do. I have taken noise samples from three vehicles...
  49. B

    Integration Help - Which Method?

    Hello, i'm having some trouble identifying the correct method to approach a problem. I don't have any working to show, so i'll explain why I think the methods I've considered are not correct. Homework Statement Integrate with respect to x the following functions. \int...
  50. evinda

    MHB How can I choose which is the most suitable method?

    Hello! (Wave) I have a question. Given the equation $t(x)=x^{2}-3x-4=0$ which roots are $-1$ and $4$ , we are looking for a suitable iterative method $x_{n+1}=\varphi(x_{n}),n=0,1,2$ so that the sequence $(x_{n})$ converges to the root $4 \forall x_{0} \in [3,5] $.Which of the following would...
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