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---
layout: page
title: "Witness complex"
meta_title: "Witness complex"
teaser: ""
permalink: /witnesscomplex/
---
{::comment}
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{:/comment}
For more details about the witness complex, please read the [user manual of the package](/doc/latest/group__witness__complex.html).
## weak_witness_persistence ##
This program computes the persistent homology with coefficient field *Z/pZ* of a Weak witness complex defined on a set of input points.
The output diagram contains one bar per line, written with the convention:
`p dim birth death`
where `dim` is the dimension of the homological feature, `birth` and `death` are respectively the birth and death of the feature,
and `p` is the characteristic of the field *Z/pZ* used for homology coefficients.
**Usage**
`weak_witness_persistence [options] <OFF input file>`
**Allowed options**
* `-h [ --help ]` Produce help message
* `-l [ --landmarks ]` Number of landmarks to choose from the point cloud.
* `-o [ --output-file ]` Name of file in which the persistence diagram is written. By default, print in std::cout.
* `-a [ --max-sq-alpha ]` (default = inf) Maximal squared relaxation parameter.
* `-p [ --field-charac ]` (default = 11) Characteristic p of the coefficient field Z/pZ for computing homology.
* `-m [ --min-persistence ]` (default = 0) Minimal lifetime of homology feature to be recorded. Enter a negative value to see zero length intervals.
* `-d [ --cpx-dimension ]` (default = 2147483647) Maximal dimension of the weak witness complex we want to compute.
**Example**
`weak_witness_persistence data/points/tore3D_1307.off -l 20 -a 0.5 -m 0.006`
N.B.: output is random as the 20 landmarks are chosen randomly.
## strong_witness_persistence ##
This program computes the persistent homology with coefficient field *Z/pZ* of a Strong witness complex defined on a set of input points.
The output diagram contains one bar per line, written with the convention:
`p dim birth death`
where `dim` is the dimension of the homological feature, `birth` and `death` are respectively the birth and death of the feature,
and `p` is the characteristic of the field *Z/pZ* used for homology coefficients.
**Usage**
`strong_witness_persistence [options] <OFF input file>`
**Allowed options**
* `-h [ --help ]` Produce help message
* `-l [ --landmarks ]` Number of landmarks to choose from the point cloud.
* `-o [ --output-file ]` Name of file in which the persistence diagram is written. By default, print in std::cout.
* `-a [ --max-sq-alpha ]` (default = inf) Maximal squared relaxation parameter.
* `-p [ --field-charac ]` (default = 11) Characteristic p of the coefficient field Z/pZ for computing homology.
* `-m [ --min-persistence ]` (default = 0) Minimal lifetime of homology feature to be recorded. Enter a negative value to see zero length intervals.
* `-d [ --cpx-dimension ]` (default = 2147483647) Maximal dimension of the weak witness complex we want to compute.
**Example**
`strong_witness_persistence data/points/tore3D_1307.off -l 20 -a 0.5 -m 0.06`
N.B.: output is random as the 20 landmarks are chosen randomly.
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