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Numerical Analysis

Numerical analysis is the study of algorithms that use numerical approximations for the problems of mathematical analysis. It continues this long tradition of practical mathematical calculations. Modern numerical analysis does not seek exact answers. This is due to the fact exact answers are often impossible to obtain in practice. Instead, numerical analysis is concern with obtaining approximate solutions while maintaining reasonable bounds on errors.

Direct methods compute the solution to a problem in a finite number of steps. These methods give precise answers if they are performed in infinite precision arithmetic. Examples of direct methods include Gaussian elimination, the QR factorization methods for solving systems of linear equations, and the simple method of linear programming. Finite precision is used and the result is an approximation of the true solution.

Iterative methods are not expected to terminate in a number of steps. Starting from an initial guess, iterative methods form successive approximations that converge to the exact solution only in the imit. A convergence test is specified in order to decide when a sufficiently accurate solution has been found. Even using infinite precision arithmetic, these methods will not reach the solution within a finite number of steps. Examples of the iterative methods include Newton’s method, the bisection method and Jacobi iteration. Iteration methods are generally needed for large scale problems.

Since the advent of computers, most algorithms are implemented in a variety of programming languages. The Netlib repository contains various collections of software routines for numerical problems. Many computer algebra systems such as Mathematica also benefit from the availability of arbitrary precision arithmetic which can provide more accurate results. 

Categories within Numerical Analysis

Computing Values of Functions

Postings: 235

A function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly out output.

Ordinary Differential Equations

Postings: 127

An ordinary differential equation is an equation containing a function of one independent variable and its derivatives.

Partial Differential Equations

Postings: 90

A partial differential equation is a differential equation that contains unknown multivariable functions and their partial derivatives.

Draw and Sketch Velocity

Answer the following questions about shipping lobsters. For each problem: ★ Include the equations or formulas you used. ★ Explain, in words or with mathematical steps, how you arrived at your answers. You do not have to submit sketches, but you may find that drawing parts of the problem on scratch paper can help you unders

Quantitative Problem Solving with excel

Question 6: 15 points The biggest inventory problem at the Barko facility is the storage of boom sections for their various Knuckleboom models. There are two types of boom sections: short and long. The following table outlines the demand in the next 5 months and the projected purchase price for each type of boom section. De

Solving 7 questions on various topics

Problem 1 Suppose a manufacturing company makes a certain item. The time to produce each item is normally distributed around a mean of 157 minutes with a standard deviation of 46 minutes. (a) What proportion of the items will take more than 2 hours to make? (b) What proportion of the items will take between 160 and 200 minu

Solving Discrete Mathematics Questions

1. After a weekend at the Mohegan Sun Casino, Gary finds that he has won $1020—in $20 and $50 chips. If he has more $50 chips than $20 chips, how many chips of each denomination could he possibly have? 2. If there are 2187 functions f : A→B and |B| = 3, what is |A|? 3. Let A ⊆ {1, 2, 3, . . . , 25} where |A| = 9.

Separation of Variables, System Progress, and Phase Diagrams

(1) Solve by separation of variables and solution to the ODE (see attached file for formula). (2) Solve the equation (see attached file for formula). (3) For the given graph, re-sketch a graph for x01 and indicate the system progress from x01 as t --> infinity. Identify any critical points as stable, unstable, and semi-stabl

Graphing and Harvesting Functions

See the attached file. Harvesting: x = a1*x - a2*x^2 - h a1 > 0, a2 > 0, h>0 1. |x| = tons and |x| = tons/years What are the dimensions of a1, a2, and h? (see attached file for more details) 2. Use the quadratic formula to show that the phase diagrams (x vs. x)have no intercepts: (see attached file for

10 Differential Equation Questions

Use separation of variables to solve to the ODE: N ̇=〖{k〗_+-k_- ln⁡〖(N)}N〗;k_+,k_- and t>0;N(0)= N_0>0. Hint: Use u = ln(N) for u-substitution. Substitute your solution into the differential equation and show that it is in fact the solution. Evaluate your solution for N(t) as t→∞ . For what va

Springdale Shopping Survey

Please see attached Excel sheet. Also below is the link to the free book for reference. (I would start there!) The question is on Page #308. 1. Item C in the description of the data collection instrume

Solution of differential equation on interval of x values

Determine the order of each differential equation, and whether or not the given functions are solutions of that equation on some interval of x values. (a) (y')^2 = 4y; Y1 = X^2, Y2 = 2X^2 , Y3 = e-x (b) Y" +9y =0; Y1 = 4sin3X, Y2 = 6sin(3X+2)

Analysing Frequency Distributions

Using Excel, prepare a frequency distribution from the data collected (see attached below). Calculate the Standard Deviation of your data. Is this a normal distribution? Every day I leave my house 15 min before I need to be to work, what are the chances I will be late to work on any given day? There are several differe

Two-Dimensional Wave Equation

1. Find the solution to the two-dimensional wave equation [see the attachment for the full equation] 2. Solve the two-dimensional wave equation for a quarter-circular membrane [see the attachment for the full equation] The boundary condition is such that u=0 on the entire boundary. 3. Consider Laplace's equation [see t

Numerical analysis and 7th degree splines

Given the points x={xo, x1, x2,.... xn}^T and the function values f={fo, f1, f2, ....fn}^T at those points, we want to generate a 7th degree spline, i.e. a piecewise 7th degree polynomial approximation. a) Why would we want to do this? Why not just use Newton's Interpolatory Divided Difference formula to get an nth degree in

The flow invariant for the nonlinear system

Please solve the following numerical analysis problem: Determine the flow Qt : R^2 into R^2 for the nonlinear system: x' =f(x) with f(x) = [ -x1 ] [ x1^2 + 2x2 ] and show that the set S = { x E R^2l x2 = -x^2/4 } is invariant with respect to the flow {Qt}. Plea

PDEs help

Hello. I am having some trouble with the following PDE: Laplacian(u(x,y,z)) = u(x,y,z) * (-2*E/h^2)*(1 + (GM/(2(x^2+y^2+z^2)^(1/2))))^4 Where, G,M,E, and h are all constants. The problem that I'm having is that there is a nonconstant factor of (x^2+y^2+z^2)^(-1/2) appearing on the RHS of this equation, making it non-tri

The 1D heat equation

Please see the attached file for the fully formatted problems. Solve the heat equation u_t = ku_xx for 0<x<L With boundary conditions u(0,t)=u(L,t)=0 Solve for the initial value conditions: a. u(x,0) = sin(5*Pi*x/L) b. u(x,0) = x c. For part b, plot the solution at t=0, 0.1, 1

Convolution theorem

Please help working on these problems Please show all steps section 7.7 # 2, See attached Use the convolution theorem to obtain a formula for the solution to the given initial value problem...

Initial-Value Problem

Please see the attached file for the fully formatted problem. Solve the IVP: y'' + 4y' +13y = 13t2 -5t +24 +e^-2t(sin 3t)

Second-order Euler equation

Please show all steps to solution. Solve the second-order homogeneous equation 4x^2y''-4xy'+3y=0, by applying the transformation v=lnx, x>0 This is a second-order Euler equation.

Nonhomogeneous equation

Please show all steps to solution. a) Find a particular solution to the nonhomogeneous equation y''''-y'''-y''-y'-2y=8x^5 Write out the general solution. b) Use the solution to problem A to solve the initial-value problem y''''-y'''-y''-y'-2y=8x^5 where y(0)=y'(0)=y'

Quasi-linear pde

I'm having trouble with a PDE problem, I've indicated in the attached file what specifically.

Numerical Analysis

The problem I need solved is attached. Please provide as much detail as possible, so I can understand. Thanks Recall that a given vector norm |X| the operator norm of matrix A is given by ......

Doolittle LU decomposition

Please see the attached problem: Please give the complete solution, include reasoning and calculations used to arrive at answer.

Diffusion Equation

Show that S(x,y,t)=S(x,t)S(y,t) satisfies the diffusion equation. S_t = k(S_xx + S_yy)

Numerical Concepts : Definitions

Please explain or define these concepts. 1. Natural number 2. Multiplication 3. Subtraction 4. Closure for addition 5. Commutativity 6. Associativity 7. Distributivity 8. Closure for multiplication 9. Contrast commutativity and associativity