György Bicsák, Dávid Sziroczák, Aaron Latty

Numerical methods


Numerical Differentiation

In everyday engineering problems, it is quite common that a known (or interpolated) function’s slope, or curvature should be determined. Of course, higher derivatives could be needed, too, but generally the first 2 derivatives are of interest. Contrary to the integration process, the derivation is relatively easy, less rules are applied; in most cases the calculation can even be carried out analytically for simpler functions and polynomials. In the case of more complex functions on the other hand the conventional method is not efficient all the time, since numerical methods can provide results in shorter time with less computational efforts. By discretizing the function, the derivatives of a function can be determined numerically only at those points. This approach seems even more reasonable when we consider that often there are discrete input points we have available, and not a defined function itself. Of course, the derivatives can be calculated by applying an interpolation method on the input points, and then differentiating the interpolated function, but of course, there are more efficient methods, too. In this subchapter, we are focusing on these more efficient solutions.

Numerical methods

Tartalomjegyzék


Kiadó: Akadémiai Kiadó

Online megjelenés éve: 2019

ISBN: 978 963 454 283 4

This book on Numerical Methods is part of the Transportation and Vehicle Engineering Faculty’s curriculum at the Budapest University of Technology and Economics, created under the Stipendium Hungaricum Scholarship Programme. The book demonstrates the aim of developing and using numerical methods. Instead of relying on more complicated and expensive analytical solution methods, simpler arithmetical equations are used to approximate the accurate solution with the required level of accuracy. After discussing the various sources and propagation of solution errors, the book discusses the solution of single variable equations and system of equations. Following chapters describe the two main curve fitting methods; approximation and interpolation. These chapters are followed by the numerical differentiation and integration methods, then finally the numerical solutions for ordinary and partial differentiation equations are outlined. MATLAB is one of the most popular choice today for numerical computing, with its user friendly, yet powerful computing capability. It is practically an industry standard for prototyping and new developments, and there is great value for students to be introduced to solving problems with MATLAB. Many chapters in the notes show examples implemented in MATLAB, with actual working code available to use and practice.

Hivatkozás: https://mersz.hu/bicsak-numerical-methods//

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