Create a Functional Matrix from Long Data — make_functional

Converts long-format repeated measurements into a common-grid matrix suitable for functional analyses. Each row corresponds to one subject and each column to one time value, such as days after planting.

Usage

make_functional_matrix(
  data,
  id_col,
  time_col,
  value_col,
  time_grid = NULL,
  fill = NA_real_
)

Arguments

data: A data frame in long format.
id_col: Subject identifier column.
time_col: Time column, such as relative day or days after planting.
value_col: Measured series column.
time_grid: Optional vector defining the common time grid. If NULL, the sorted unique values in time_col are used.
fill: Value used for missing combinations.

Value

A list with y, time, and id.