TangentImageHandler: TangentImageHandler Class

In riemtan: Riemannian Metrics for Symmetric Positive Definite Matrices

TangentImageHandler Class

Description

TangentImageHandler Class

TangentImageHandler Class

Details

This class handles tangent images on a manifold. It provides methods to set a reference point, compute tangents, and perform various operations using a provided metric. Initialize the TangentImageHandler

Error if the tangent images have not been specified

Error if the reference point is not an object of class dppMatrix

Error if the matrix is not of type dspMatrix Tangent images getter

Active bindings

ref_point

A matrix of type dppMatrix

tangent_images

A list of dspMatrix objects

Methods

Public methods

• TangentImageHandler$new()

• TangentImageHandler$set_reference_point()

• TangentImageHandler$compute_tangents()

• TangentImageHandler$compute_vecs()

• TangentImageHandler$compute_conns()

• TangentImageHandler$set_tangent_images()

• TangentImageHandler$add_tangent_image()

• TangentImageHandler$get_tangent_images()

• TangentImageHandler$relocate_tangents()

• TangentImageHandler$clone()

---

Method new()

Usage

TangentImageHandler$new(metric_obj, reference_point = NULL)

Arguments

metric_obj

An rmetric object for operations.

reference_point

An optional reference point on the manifold.

Returns

A new instance of TangentImageHandler. Set a new reference point.

---

Method set_reference_point()

If tangent images have been created, it recomputes them by mapping to the manifold and then to the new tangent space.

Usage

TangentImageHandler$set_reference_point(new_ref_pt)

Arguments

new_ref_pt

A new reference point of class dppMatrix.

Returns

None. Computes the tangent images from the points in the manifold

---

Method compute_tangents()

Usage

TangentImageHandler$compute_tangents(manifold_points)

Arguments

manifold_points

A list of connectomes

Returns

None Computes vectorizations from tangent images

---

Method compute_vecs()

Usage

TangentImageHandler$compute_vecs()

Returns

A matrix, each row of which is a vectorization Computes connectomes from tangent images

---

Method compute_conns()

Usage

TangentImageHandler$compute_conns()

Returns

A list of connectomes Setter for the tangent images

---

Method set_tangent_images()

Usage

TangentImageHandler$set_tangent_images(reference_point, tangent_images)

Arguments

reference_point

A connectome

tangent_images

A list of tangent images

Returns

None Appends a matrix to the list of tangent images

---

Method add_tangent_image()

Usage

TangentImageHandler$add_tangent_image(image)

Arguments

image

Matrix to be added

---

Method get_tangent_images()

Usage

TangentImageHandler$get_tangent_images()

Returns

list of tangent matrices Wrapper for set_reference_point

---

Method relocate_tangents()

Usage

TangentImageHandler$relocate_tangents(new_ref_pt)

Arguments

new_ref_pt

The new reference point

Returns

None

---

Method clone()

The objects of this class are cloneable with this method.

Usage

TangentImageHandler$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

riemtan documentation built on June 8, 2025, 9:39 p.m.