## Section 3.3

# Interpolation and Regression

- What is interpolation?
- What is regression?
- What are they useful for?
- Numerical analysis in MATLAB
- Plotting numerical models

- Numerical model
- Passes through all data points
- polyfit: order of polynomial must be n-1

- Numerical model
- Does not have to pass through all data points
- polyfit: pick order of polynomial (must be n-1 or less)

### What are they useful for?

### Numerical analysis in MATLAB

### Plotting numerical models