# Examples¶

## Model Examples¶

These are examples of the flexibility of `symfit`

Models. This is because
essentially any valid `sympy`

code can be provided as a model. This makes
it very intuitive to define your mathematical models almost as you would on
paper.

- Example: Fourier Series
- Example: Piecewise continuous function
- Example: Polynomial Surface Fit
- Example: ODEModel for Reaction Kinetics
- Example: Multiple species Reaction Kinetics using ODEModel
- Example: Piecewise model using CallableNumericalModel
- Example: ODEModels as subproblems using CallableNumericalModel
- Example: Matrix Equations using Tikhonov Regularization

## Objective Examples¶

These are examples on how to use a different objective function from the standard least-squares objective, such as likelihood fitting.

## Minimizer Examples¶

These examples demonstrate the different minimizers available in `symfit`

.

## Interactive Guess Module¶

The `symfit.contrib.interactive_guess`

contrib module was designed to make
the process of finding initial guesses easier, by presenting the user with an
interactive `matplotlib`

window in which they can play around with the
initial values.