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Add numbers-at-length to a DATRAS object

Source: R/length.R
add_numbers_at_length.Rd

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 = get_accuracy_cm(x))

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. Defaults to the survey's native recording resolution via get_accuracy_cm(). 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)
#> Warning: Mixed accuracies found in var[[3]]$LngtCode - worst chosen: 1 cm
#> Warning: NAs found in var[[3]]$LngtCode - assumed to be 1 cm