Get SPD Matrix Representations from a HATSA Projector Object
Source:R/spd_representations.R
get_spd_representations.RdExtracts or computes various types of Symmetric Positive-Definite (SPD) matrix representations for subjects from a `hatsa_projector` object.
Usage
get_spd_representations(object, ...)
# S3 method for class 'hatsa_projector'
get_spd_representations(
object,
type = c("cov_coeffs", "fc_conn"),
subject_idx = NULL,
regularize_epsilon = 1e-06,
subject_data_list_for_fc = NULL,
k_conn_params_for_fc = list(),
...
)
# S3 method for class 'task_hatsa_projector'
get_spd_representations(
object,
type = c("cov_coeffs", "fc_conn", "fc_task", "fc_hybrid"),
subject_idx = NULL,
regularize_epsilon = 1e-06,
subject_data_list_for_fc = NULL,
k_conn_params_for_fc = list(),
lambda_blend_for_hybrid = NULL,
...
)Arguments
- object
A `hatsa_projector` or `task_hatsa_projector` object.
- ...
Additional arguments, potentially passed to specific computation functions.
- type
Character string indicating the type of SPD representation to use. Currently supported for `hatsa_projector`: `"cov_coeffs"` (covariance of aligned spectral coefficients). Other types like `"fc_conn"` might be added or supported by specific methods.
- subject_idx
Optional integer or vector of integers. If provided, returns SPD matrices only for these subjects. If NULL (default), for all subjects.
- regularize_epsilon
Small positive value for SPD regularization. Default from RGEOM-001.
- subject_data_list_for_fc
Optional list of subject time-series matrices (T_i x V_p), needed for `type = "fc_conn"`.
- k_conn_params_for_fc
List of parameters for `compute_subject_connectivity_graph_sparse`, e.g., `list(k_conn_pos = 10, k_conn_neg = 10, zscore_type = "abs", ...)`. Needed for `type = "fc_conn"`.