Create a Group of Observations from Matrix or List Data

Creates an observation group object that provides a unified interface for accessing individual observations from different data structures (matrices, lists, or deflists). Each observation is wrapped in a function that provides lazy evaluation.

Usage

obs_group(X, fun = NULL, ind = NULL)

Arguments

X

A matrix, list, or deflist containing the data

fun

Optional function to apply to each observation

ind

Optional vector of indices for the observations. If NULL, uses sequential indices

Value

An observation_set object containing lazy-evaluated observations

Details

Create an Observation Group

See also

Other multiframe functions: [.observation_set(), [[.observation_set(), multiframe.list(), multiframe.matrix(), split.multiframe(), subset.multiframe(), summarize_by.multiframe(), xdata.multiframe()

Examples

# From a matrix
X <- matrix(rnorm(100), 20, 5)
obs <- obs_group(X)

# From a list
X_list <- list(a=1:5, b=6:10, c=11:15)
obs_list <- obs_group(X_list)