Add numbers-at-length to a DATRAS object

Calculates numbers-at-length for each haul and stores the result in the HH table of a DATRASraw object as matrix N, with one row per haul and one column per length class.

Usage

add_numbers_at_length(x, cm_breaks = NULL, by = 1)

Arguments

x

A DATRASraw object.

cm_breaks

Numeric vector of break points defining the length classes in cm. If NULL, break points are created automatically from the observed range of HL$LngtCm using by.

by

Numeric scalar giving the width of the default length classes in cm. Default is 1cm (for herring, sprat and other smaller species 0.5 might be more appropriate). Only used when cm_breaks = NULL.

Value

A DATRASraw object with numbers-at-length added to the HH component as matrix N.

Details

By default, numbers-at-length are calculated using the available haul-level length data in HL and the default length recording resolution of the data.

The function first adds numbers-at-length at the finest available length resolution and stores the result as x[["HH"]][["N"]].

The applied break points are stored as attribute cm.breaks on the returned object.

See also

add_total_numbers_by_haul()

Examples

## Add numbers-at-length using the default length resolution
x <- add_numbers_at_length(dab)