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Expand Length Frequency Data for a Single Species Row

expand_length_frequency.Rd

Takes a single species row and expands it into multiple rows if length frequency data is present. Preserves all metadata (counting_method, species, etc.) throughout.

Usage

expand_length_frequency(species_row)

Arguments

species_row

A single-row data frame containing one species record

Value

A data frame with one or more rows:

  • If length frequency data exists: multiple rows (one per length bin)

  • If no length frequency data: single row with NA for length fields

Details

This function processes length frequency data in a row-by-row manner, which is simpler and more robust than extracting all length data first and then joining.

The function:

  1. Identifies length group columns in the row

  2. If found: pivots them to create multiple rows (one per length bin)

  3. If not found: returns the row as-is with NA length fields

  4. Always preserves all metadata columns