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----
-layout: page
-title: "Witness complex"
-meta_title: "Witness complex"
-teaser: ""
-permalink: /witnesscomplex/
----
-{::comment}
-Leave the lines above as it is required by the web site generator 'Jekyll'
-{:/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.