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Copy file name to clipboardExpand all lines: README.Rmd
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A simplicial complex is a set of [simplices](https://en.wikipedia.org/wiki/Simplex), they can be seen as higher dimensional generalization of graphs. These are mathematical objects that are both topological and combinatorial, a property making them particularly useful for TDA. The challenge here is to define such structures that are proven to reflect relevant information about the structure of data and that can be effectively constructed and manipulated in practice. Below is an exemple of simplicial complex:
A filtration is an increasing sequence of sub-complexes of a simplicial complex $\mathcal{K}$. It can be seen as ordering the simplices included in the complex $\mathcal{K}$. Indeed, simpicial complexes often come with a specific order, as for [Vietoris-Rips complexes](https://en.wikipedia.org/wiki/Vietoris%E2%80%93Rips_complex), [Cech complexes](https://en.wikipedia.org/wiki/%C4%8Cech_complex) and [alpha complexes](https://en.wikipedia.org/wiki/Alpha_shape#Alpha_complex).
TDA signatures can extracted from point clouds but in many cases in data sciences the question is to study the topology of the sublevel sets of a function.
Above is an example for a function defined on a subset of $\mathbb{R}$ but in general the function $f$ is defined on a subset of $\mathbb{R}^d$.
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Persistent homology is a powerful tool to compute, study and encode efficiently multiscale topological features of nested families of simplicial complexes and topological spaces. It encodes the evolution of the homology groups of the nested complexes across the scales. The diagram below shows several level sets of the filtration:
[Notebook: persistence diagrams](Tuto-GUDHI-persistence-diagrams.ipynb) In this notebook we show how to compute barcodes and persistence diagrams from a filtration defined on the Protein binding dataset. This tutorial also introduces the bottleneck distance between persistence diagrams.
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