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Lagrangian Interpolation

Lagrangian Interpolation. Computer Engineering Majors Authors: Autar Kaw, Jai Paul http://numericalmethods.eng.usf.edu Transforming Numerical Methods Education for STEM Undergraduates. Lagrange Method of Interpolation http://numericalmethods.eng.usf.edu. What is Interpolation ?.

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Lagrangian Interpolation

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  1. Lagrangian Interpolation Computer Engineering Majors Authors: Autar Kaw, Jai Paul http://numericalmethods.eng.usf.edu Transforming Numerical Methods Education for STEM Undergraduates http://numericalmethods.eng.usf.edu

  2. Lagrange Method of Interpolationhttp://numericalmethods.eng.usf.edu

  3. What is Interpolation ? Given (x0,y0), (x1,y1), …… (xn,yn), find the value of ‘y’ at a value of ‘x’ that is not given. http://numericalmethods.eng.usf.edu

  4. Interpolants Polynomials are the most common choice of interpolants because they are easy to: • Evaluate • Differentiate, and • Integrate. http://numericalmethods.eng.usf.edu

  5. Lagrangian Interpolation http://numericalmethods.eng.usf.edu

  6. Example A robot arm with a rapid laser scanner is doing a quick quality check on holes drilled in a rectangular plate. The hole centers in the plate that describe the path the arm needs to take are given below. If the laser is traversing from x = 2 to x = 4.25 in a linear path, find the value of y at x = 4 using the Lagrange method for linear interpolation. Figure 2 Location of holes on the rectangular plate. http://numericalmethods.eng.usf.edu

  7. Linear Interpolation http://numericalmethods.eng.usf.edu

  8. Linear Interpolation (contd) http://numericalmethods.eng.usf.edu

  9. Quadratic Interpolation http://numericalmethods.eng.usf.edu

  10. Example A robot arm with a rapid laser scanner is doing a quick quality check on holes drilled in a rectangular plate. The hole centers in the plate that describe the path the arm needs to take are given below. If the laser is traversing from x = 2 to x = 4.25 in a linear path, find the value of y at x = 4 using the Lagrange method for quadratic interpolation. Figure 2 Location of holes on the rectangular plate. http://numericalmethods.eng.usf.edu

  11. Quadratic Interpolation http://numericalmethods.eng.usf.edu

  12. Quadratic Interpolation (contd) http://numericalmethods.eng.usf.edu

  13. Comparison Table http://numericalmethods.eng.usf.edu

  14. Example A robot arm with a rapid laser scanner is doing a quick quality check on holes drilled in a rectangular plate. The hole centers in the plate that describe the path the arm needs to take are given below. If the laser is traversing from x = 2 to x = 4.25 in a linear path, find the value of y at x = 4 using a fifth order Lagrange polynomial. Figure 2 Location of holes on the rectangular plate. http://numericalmethods.eng.usf.edu

  15. Fifth Order Interpolation http://numericalmethods.eng.usf.edu

  16. Fifth Order Interpolation (contd) http://numericalmethods.eng.usf.edu

  17. Fifth Order Polynomial (contd) http://numericalmethods.eng.usf.edu

  18. Fifth Order Polynomial (contd) http://numericalmethods.eng.usf.edu

  19. Fifth Order Polynomial (contd) http://numericalmethods.eng.usf.edu

  20. Fifth Order Polynomial (contd) http://numericalmethods.eng.usf.edu

  21. Additional Resources For all resources on this topic such as digital audiovisual lectures, primers, textbook chapters, multiple-choice tests, worksheets in MATLAB, MATHEMATICA, MathCad and MAPLE, blogs, related physical problems, please visit http://numericalmethods.eng.usf.edu/topics/lagrange_method.html

  22. THE END http://numericalmethods.eng.usf.edu

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