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https://github.com/JuliaDiff/TaylorSeries.jl

Taylor polynomial expansions in one and several independent variables.
https://github.com/JuliaDiff/TaylorSeries.jl

automatic-differentiation julia polynomials taylor-expansions

Last synced: about 2 months ago
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Taylor polynomial expansions in one and several independent variables.

Host: GitHub
URL: https://github.com/JuliaDiff/TaylorSeries.jl
Owner: JuliaDiff
License: other
Created: 2014-03-01T19:43:17.000Z (over 10 years ago)
Default Branch: master
Last Pushed: 2024-07-27T18:34:23.000Z (about 2 months ago)
Last Synced: 2024-07-27T19:45:47.951Z (about 2 months ago)
Topics: automatic-differentiation, julia, polynomials, taylor-expansions
Language: Julia
Homepage:
Size: 4.73 MB
Stars: 338
Watchers: 18
Forks: 51
Open Issues: 39
Metadata Files:
- Readme: README.md
- License: LICENSE.md
- Citation: CITATION.bib

Awesome Lists containing this project

awesome-sciml - JuliaDiff/TaylorSeries.jl: A julia package for Taylor polynomial expansions in one and several independent variables.

README

        # TaylorSeries.jl

A [Julia](http://julialang.org) package for Taylor polynomial expansions in one or more

independent variables.

[![CI](https://github.com/JuliaDiff/TaylorSeries.jl/workflows/CI/badge.svg)](https://github.com//JuliaDiff/TaylorSeries.jl/actions)

[![Coverage Status](https://coveralls.io/repos/github/JuliaDiff/TaylorSeries.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaDiff/TaylorSeries.jl?branch=master)

[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliadiff.org/TaylorSeries.jl/stable)

[![](https://img.shields.io/badge/docs-latest-blue.svg)](https://juliadiff.org/TaylorSeries.jl/latest)

[![DOI](http://joss.theoj.org/papers/10.21105/joss.01043/status.svg)](https://doi.org/10.21105/joss.01043)

[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.2601941.svg)](https://zenodo.org/record/2601941)

#### Authors

- [Luis Benet](http://www.cicc.unam.mx/~benet/), Instituto de Ciencias Físicas,

Universidad Nacional Autónoma de México (UNAM)

- [David P. Sanders](http://sistemas.fciencias.unam.mx/~dsanders/), Facultad

de Ciencias, Universidad Nacional Autónoma de México (UNAM)

Comments, suggestions and improvements are welcome and appreciated.

#### Examples

Taylor series in one variable

```julia

julia> using TaylorSeries

julia> t = Taylor1(Float64, 5)

 1.0 t + 𝒪(t⁶)

julia> exp(t)

 1.0 + 1.0 t + 0.5 t² + 0.16666666666666666 t³ + 0.041666666666666664 t⁴ + 0.008333333333333333 t⁵ + 𝒪(t⁶)

 julia> log(1 + t)

 1.0 t - 0.5 t² + 0.3333333333333333 t³ - 0.25 t⁴ + 0.2 t⁵ + 𝒪(t⁶)

 ```

Multivariate Taylor series

 ```julia

julia> x, y = set_variables("x y", order=2);

julia> exp(x + y)

 1.0 + 1.0 x + 1.0 y + 0.5 x² + 1.0 x y + 0.5 y² + 𝒪(‖x‖³)

```

Differential and integral calculus on Taylor series:

```julia

julia> x, y = set_variables("x y", order=4);

julia> p = x^3 + 2x^2 * y - 7x + 2

 2.0 - 7.0 x + 1.0 x³ + 2.0 x² y + 𝒪(‖x‖⁵)

julia> ∇(p)

2-element Array{TaylorN{Float64},1}:

  - 7.0 + 3.0 x² + 4.0 x y + 𝒪(‖x‖⁵)

                    2.0 x² + 𝒪(‖x‖⁵)

julia> integrate(p, 1)

 2.0 x - 3.5 x² + 0.25 x⁴ + 0.6666666666666666 x³ y + 𝒪(‖x‖⁵)

julia> integrate(p, 2)

 2.0 y - 7.0 x y + 1.0 x³ y + 1.0 x² y² + 𝒪(‖x‖⁵)

```

For more details, please see the [docs](http://www.juliadiff.org/TaylorSeries.jl/stable).

#### License

`TaylorSeries` is licensed under the [MIT "Expat" license](./LICENSE.md).

#### Installation

`TaylorSeries` can be installed simply with `using Pkg; Pkg.add("TaylorSeries")`.

#### Contributing

There are many ways to contribute to this package:

- Report an issue if you encounter some odd behavior, or if you have suggestions to improve the package.

- Contribute with code addressing some open issues, that add new functionality or that improve the performance.

- When contributing with code, add docstrings and comments, so others may understand the methods implemented.

- Contribute by updating and improving the documentation.

#### References

- W. Tucker, Validated numerics: A short introduction to rigorous

computations, Princeton University Press (2011).

-  A. Haro, Automatic differentiation methods in computational dynamical

systems: Invariant manifolds and normal forms of vector fields at fixed points,

[preprint](http://www.maia.ub.es/~alex/admcds/admcds.pdf).

#### Acknowledgments

This project began (using `python`) during a Masters' course in the postgraduate

programs in Physics and in Mathematics at UNAM, during the second half of 2013.

We thank the participants of the course for putting up with the half-baked

material and contributing energy and ideas.

We acknowledge financial support from DGAPA-UNAM PAPIME grants

PE-105911 and PE-107114, and DGAPA-PAPIIT grants IG-101113,

IG-100616, IG-100819 and IG-101122.

LB acknowledges support through a *Cátedra Moshinsky* (2013).