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. Magnetosphere

    Simple method for testing graphene

    I saw this video for testing whether one has graphene or graphite and was wondering about the authenticity of the method. By mixing 50%h2o and 50%gasoline the graphene should separate/settle in between the two within a second after shaking. Here are some pictures of my own experiment before...
  2. Zouatine

    Solve Castigiliano Method for Continuous Beam Problem

    Homework Statement Problem: a continuous beam ABC simply presses, loaded with a distributed load q, the length of the beam is 2L. EI=constant find the reactions in the beam ,we use Castigiliano method. Homework Equations - U=(1/2EI)∫M^2 dx (U: Energy) - dU/dP=d (d: displacement) The...
  3. Nick Amos

    Tabular Method for a Unique Spur Gear Differential System

    Hello everyone, this is my first post here so please excuse me if its in the wrong area. I am looking for the tabular approach to solve a complex gear train based off the spur gear differential design. Attached is a photo of the differential. The requirements of the necessary differential...
  4. J

    MHB Resolution method and counterexample

    Hi! Am new to this forum, but I have looked around here for some time now, since am studying a course of logic in the context of computer science. I have a very important exam in a few days, and while I thought I got it, I got shocked when I was looking on previous graded exams to see what I...
  5. stipan_relix

    How to find power and voltage using the mesh current method?

    Hi. I am practising for my test and since I don't have the correct answers, I don't know if what I'm doing is right. I tried to solve this problem, can you check it and correct if it's wrong? Here's a clearer picture of the circuit. I suspect Uab isn't right, but am not sure. Thanks...
  6. C

    I Writing Metric in Matrix Form: Method?

    In ##c=1## units, from my SR courses I was told for example, that the Minkowski metric ## ds^2 = -dt^2 + dx^2 + dy^2 + dz^2 ## can be written in matrix form as the below.. \eta = \begin{pmatrix} -1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{pmatrix} And it was just...
  7. S

    Differential equation with power series method

    Homework Statement I need to solve the DE y’ = x^2y using the power series method Homework Equations y = sum(0->inf)Cnx^n y’ = sum(1->inf)nCnx^(n-1) The Attempt at a Solution I plug in the previous two equations into the DE. What is the general procedure for these problems after that...
  8. K

    Simpson's method, error estimate

    Homework Statement Hello, using Simpson´s method, one can calculate the number of intervals needed to achieve a given accuracy, through the error formula. Is there any other way to know that the required accuracy is achieved other than computing the integral and comparing it to the result from...
  9. J

    Quarter amplitude response method: PID settings

    Homework Statement see attached, question 8a and b are what I'm attempting. I've also attached the VERY brief course notes that I'm required to work with. I know Tc= 8 seconds from the graph (0.13minutes) Gain set to 4. is PB therefore 100/4=25%? I'm struggling to calculate the ratio of...
  10. 1

    Solving an ODE by the method of Integrating Factors

    1. y' + y = x y2/32. The problem states we need to solve this ODE by using the method of integrating factors. Every example I found on the internet involving this method was of the form: y' + Py = Q Where P and Q are functions of x only. In the problem I was given however, Q is a function of...
  11. astroman707

    Other What's your note taking method in physics classes?

    Upon entering my first physics class, I've noticed that taking notes is radically different than in any other class. It seems that during lecture one has two options. Option 1: Don't take very many notes at all, and instead focus on the lecture. Option 2: Take good notes, and miss what the...
  12. yecko

    Conduction - finite difference method

    Homework Statement Homework Equations Finite difference method The Attempt at a Solution I have tried two different approaches, but still i am wrong in the question. Can anyone guide me how to attempt this question? Thank you
  13. N

    1st Order Differential Equation - Power Series Method

    Homework Statement The Attempt at a Solution I have deliberately made several obvious steps, because I keep ending up here. However I have no idea what to do from here. I thought about the fact, that differential equations have the solution ##x = x_{HOM} + x_{Inhom}##, but the ##x_{HOM}##...
  14. DLeuPel

    B Understanding the Parallelogram Method for Solving Forces

    How does the parallelogram method work to solve one of two forces with different angles? Or better said, how do you derive the method so that I can get a better understanding of it ?
  15. B

    No problem, happy to help! Keep up the good work in your studies.

    Homework Statement The z = 0 plane is a grounded conducting surface. A point charge q is at (0,0,a), and charge 4q at (0,-2a,a). Calculate the potential in the region z > 0. Homework Equations V=∑kq/rThe Attempt at a Solution [/B] Use the method of images. V1 = kq/r+ + kq/r- V1=kq(1/sqrt(x^2...
  16. G

    System of multiple conductors: image method

    Homework Statement The following figure represent the traversal cut of a system with two cylindrical equal conductors of radius r0 length l at a distance d from one another and at the same distance h of a plane conductor (conductor zero). The dielectric that surrounds the conductors is the air...
  17. E

    Did I use the correct identities in my variation method calculations?

    <Moderator's note: Moved from a technical forum and thus no template.> Problem: One dimensional quartic oscillator, V(x) = cx^4 (c is a constant) Use the trial function e^(-aplha(x^2)/2) to determine the value of the appropriate variational integral W. I've attached a picture of my work. I...
  18. S

    How do I get the solution with the matrix exponential method

    Homework Statement a = [1 1;4 1] Homework Equations R = M^-1 * a * M X = M * e^(R*t) * M^-1 * x M is matrix of eigenvectors. The Attempt at a Solution lambda = 3, -1 initial conditions: x = [1 1]' at t = .1 eigenvectors: k1 = [1 2]' k2 = [1 -2]' M = [1 1;2 -2] M^-1 = [.5 .25...
  19. Y

    MHB Substitution Method to solve linear simultaneous equation

    What I have done: I changed all fractions to common denom and that gave me 5y-5x=1 (1) *I numbered the fractions 5y+2x=5 (2) Then: 5y=5-2x Substitute into equation 1 (5-2x)-5x=1 5-7x=1 x=4/7 Thing is my answer says I should be getting x=0 Any hints?
  20. S

    What is the best method for electromagnetic propulsion?

    I mean by the best the one that use the least energy to produce the grater force capable of carrying weights . Say you have a pulley attached to a ceiling with height of 3 meters, around the pulley is a string that attached to a 30 kg weight and on the other side of the string you want to use...
  21. AchillesWrathfulLove

    When using the Superposition method to solve a circuit....

    do you eliminate an independent current/voltage source one at a time or can you do all of them at once. Let us say you have 5 independent voltage sources and 5 independent current sources. Do you short circuit 5 of those voltage sources and leave 5 independent current sources or do you have to...
  22. AchillesWrathfulLove

    When using the Mesh Current Method -- How to handle current sources facing the wrong way

    When using the Mesh Current Method and you encounter a loop with a current source that is going opposite to the mesh current do you write it down as a negative current source?
  23. K

    Using Macaulay's method of deflection on a cantilever beam

    Homework Statement i) Determine the slope of the beam 1m from the wall. ii) Calculate the deflection at the free end of the beam. Homework Equations Macauly's method of deflection: M = -RX + W[X-a] Integrate once for slope Integrate twice for deflection The Attempt at a Solution [/B] It...
  24. Jenab2

    I How to get state vector in 4-observation method of Gauss

    In the four-observation method of Gauss for orbit determination, the right ascension and declination of an asteroid is observed at specified times, and the heliocentric position of Earth is obtained from tables (or JPL Horizons) for those same times. I can follow the procedure to the point...
  25. YoungPhysicist

    Quadratic function solution method optimizing

    Homework Statement For which values of b will the quadratic function ƒ(x) = x2-2bx+7 have a minimum value of 6? Homework Equations y = ax2+bx+c y = a(x-h)2+k b(first one) = -2ah(second one) c(first one) = ah2+k(second one) The Attempt at a Solution...
  26. J

    Gravitation & Orbital Mechanics: Is One Method More Correct Than the Other?

    I have been going through problems in my textbook and have a question. The chapter is on gravitation and orbital mechanics. When answering the problems I seem to head towards different methods than what the book prescribes. My answers, primarily using known orbital equations, are close, but not...
  27. D

    Win10 change in method of adding file to 'path'?

    I am trying to add 'pip' in Python/Scripts to path in Win10 but the method available to do this seems to have changed recently. I used to just double click on 'path' in 'system variables' and paste path to pip (or whatever) at the end of a string of similar paths separated by a semicolon. But...
  28. S

    I Understand Tight Binding Method: Coulomb Potential, 2D Case & More

    I'm trying to understand the tight binding method but I'm struggling with a lot of the mathematical formalism. A lot of the mathematical formalism I read jumps into explaining it a few too many steps ahead of where my understanding is. I understand it's an approach to calculating the band...
  29. S

    Fortran Getting my method of bisection to output the correct value

    I am trying to write a program that calculates the root of chi-square. I am not getting the correct answer and I honestly am at my wits end trying to figure it out. I know my simp_p() method is returning the correct value, but for some reason my root_chisq() method is not giving me the correct...
  30. S

    Method to create a high current and low voltage

    How would I be able to produce a circuit that produces a very high current at a very low voltage? Would it be considered a reverse Tesla coil?
  31. M

    MHB Using Euler's Method to find the general solution to the diff. equation

    Could someone please provide guidance on how to begin this problem? I've attached the preface to the assignment question.Show that the general solution of the differential equation y″(x)=−y(x) is y(x)=Acos(x)+Bsin(x) where A and B are arbitrary constants. Hint: You'll need the Taylor series...
  32. twist.1995

    A Restricted Open Shell Hartree Fock Method

    Hello, dear scientists and forum users. I have recently finished programming the restricted closed-shell and unrestricted Hartree-Fock matrix equations. They seem to work fine for small diatomic molecules. However, I cannot understand the restricted open-shell theory that was firstly published...
  33. twist.1995

    A Symmetry Considerations in Hartree-Fock-Roothaan Method

    Hello, dear Quantum Chemists or Physicists. I have been extensively researching the restricted closed-shell Hartree-Fock method, and wrote a code that is working for diatomic molecules, like H2 or He2++. I, however, have a few unresolved questions that do not allow me to proceed further in...
  34. Y

    MHB A NEW Method for solving differential equation - case studies

    Hi, This is a NEW method for solving differential equations - Case Studies. Please go to this website to see how: http://www.sysins.com Thanks. Yousif Sammour.
  35. Andy Resnick

    I Immersed Boundary method and No-Slip condition

    Just got back from a conference where one of the invited speakers presented his work on using the Immersed Boundary method with Adaptive Mesh (to model cardiovascular flow): https://cims.nyu.edu/~griffith/ This summer, I have an undergrad modeling pulsatile flow in an elastic tube using the...
  36. I

    MHB Applying the annuity method - how?

    Hello, I was given following task: A food processing company has to make a decision whether or not to expand its production facilities. A feasibility study showed the following estimates: Initial cost outlay €800,000 Further outlay in 4 years €600,000 Residual value after 10 years €200,000...
  37. Aun Muhammad

    Fortran 1D Shallow Water Wave in FORTRAN using LAX WENDROFF Method

    Hey everyone, I’m trying to simulate a 1D Shallow Water wave in FORTRAN using the Lax Wendroff Method. The case is fairly simple. I have a wave generator on one end of a water pool and a wall boundary on another. The waves start traveling towards the wall and are ‘reflected off’ the wall. The...
  38. BillTre

    New Mutagenic Method: Mini Singlet Oxygen Generator

    TIL learned about a new (to me) method of mutagenesis: (I was going to do a TIL but it seemed too Biology-y, so its like TIL, Biology version!) Someone made a piece of protein called Mini Singlet Oxygen Generator (miniSOG). It makes reactive oxygen species (ROS) upon blue-light illumination...
  39. xaratustra

    NASA Calculating Super Accurate Ephemerides: NASA's Method

    I was wondering, how does NASA actually calculate their super exact Ephemerides?
  40. M

    MHB Explore the Multiple Grid Method: Get Accurate Solution Faster

    Hey! :o I am trying to understand the multiple grid method. The idea is to use at each step different grids to solve a linear system of differential equations, so that we get the best approximation as possible. It holds that the finer the discretization, the more accurate the solution ist...
  41. mertcan

    Computational High order nonlinear operator split method

    Hi, I really need to have sources related to high order operator split method for nonlinear pdf ode equations. Could you provide me with sources about that books files videos links...??
  42. A

    A Helium atom, variation method and virial theorem

    I need to calculate the energy of the ground state of a helium athom with the variational method using the wave function: $$\psi_{Z_e}(r_1,r_2)=u_{1s,Z_e}(r1)u_{1s, Z_e}(r2)=\frac{1}{\pi}\biggr(\frac{Z_e}{a_0}\biggr)^3e^{-\frac{Z_e(r_1+r_2)}{a_0}}$$ with ##Z_e## the effective charge considered...
  43. AdrianMachin

    Ambiguity in finding errors using natural logarithm method

    Homework Statement [/B] I was reviewing this stuff and although I excelled at it once, I seem to forget some of it. For example, please consider this: Homework Equations R_C=\frac {R_1R_2} {R_1+R_2} + R_3 Here's the correct formula for its error: \Delta R_C=\frac {R_1R_2} {R_1+R_2} \left[...
  44. Aun Muhammad

    Fortran Successive Over Relaxation Method in FORTRAN

    Hey everyone. I've attached a code I have written in FORTRAN implementing the SOR Method for a 2 D Laplace Equation. Subroutines have been created, grid has been created and initial and BC's applied appropriately. While computing the error of each iteration, I am unable to achieve the desired...
  45. donaldparida

    B Methods of integration: direct and indirect substitution

    I have seen two approaches to the method of integration by substitution (in two different books). On searching the internet i came to know that Approach I is known as the method of integration by direct substitution whereas Approach II is known as the method of integration by indirect...
  46. mertcan

    A Higher Order Operator Splitting Method

    Hi, in the link https://www.researchgate.net/profile/Andrew_Sornborger/publication/220662120_Higher-order_operator_splitting_methods_for_deterministic_parabolic_equations/links/568ffaab08aec14fa557b85e/Higher-order-operator-splitting-methods-for-deterministic-parabolic-equations.pdf and equation...
  47. J

    Method of images for a line source

    Homework Statement Consider the curve C (image attached). C coincides with the real-z axis for $$|z| > a$$ and, in $$|z| < a$$ C coincides with the semi-circle $$|z| = a, =z > 0$$ In terms of simple singular flows, what is the image in C of a line source of strength 2πm lying at z = z_0, above...
  48. U

    How to understand dimensionless data of MacCormack's method

    Dear, everyone.. I am doing a numerical investigation of unsteady heat transfer in a Newtonian fluid occupying a square cavity. I solved numerically using HSMAC(Highly Simplified Marker and Cell) finite difference approach as the governing dimensionless equation. The fluid flow is simulated...
  49. Jeviah

    Does the angle of a beam fixed at two points affect the method?

    Homework Statement if a beam fixed at two points is on an angle say 45 degrees from the x or y-axis instead of running parallel to x-axis in most questions does this effect calculations? The force acting upon it would be a load directly downwardsHomework Equations N/A The Attempt at a Solution...
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