# Computational Physics - PowerPoint PPT Presentation

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Computational Physics. Matlab. With. ( Interpolation and Curve Fitting ). Prof. Muhammad Saeed. Interpolation.  Evenly Spaced Data. a)Newton-Gregory Forward Formula.  Unevenly Spaced Data. a)Lagrange Polynomials (Cubic). b)Divided Difference. c)Cubic Spline.

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Computational Physics

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## Computational Physics

Matlab

With

( Interpolation and Curve Fitting )

Interpolation

Evenly Spaced Data

• a)Newton-Gregory Forward Formula

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Unevenly Spaced Data

• a)Lagrange Polynomials (Cubic)

• b)Divided Difference

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• c)Cubic Spline

For condition 1 (Natural Spline):

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2.Curve Fitting

Least-Squares Approximations

y= a

Functions to Fit

1) y = mx+c

2)Polynomial

2)y = aebx

3)y = a log(x) + b

4)y = axb

5)

6)y = ax2 +bx

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a)Polynomial Fit

The Best Fit is determined by the minimum value of

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Problem:

Weight to Height Ratio of Human Beings

Use

as mathematical model

W=aHb

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b)Line Regression

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c)Polynomial Regression

‘m’ is the degree of polynomial

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End

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