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Create an Observation Object

Source: R/all_generic.R, R/multiframe.R
observation.Rd

Constructs a new lazy-evaluated observation object from various data sources. An observation represents a single row, element, or vector from a data source that can be accessed on demand.

Usage

observation(x, i)

# S3 method for class 'deflist'
observation(x, i)

# Default S3 method
observation(x, i)

# S3 method for class 'matrix'
observation(x, i)

# S3 method for class 'list'
observation(x, i)

Arguments

x

The data source (matrix, list, vector, or other supported object)

i

The index of the observation to extract

Value

A function that, when called, returns the specified observation from the data source

See also

[multiframe()], [obs_group()]

Examples

# From a matrix
X <- matrix(1:20, 5, 4)
obs1 <- observation(X, 2)  # Create observation for row 2
obs1()  # Retrieve the observation (returns row 2 as a 1xn matrix)
#>      [,1] [,2] [,3] [,4]
#> [1,]    2    7   12   17

# From a list
X_list <- list(a=1:5, b=6:10, c=11:15)
obs2 <- observation(X_list, 3)  # Create observation for 3rd element
obs2()  # Retrieve the observation (returns the 3rd element: 11:15)
#> [1] 11 12 13 14 15