sigmoid_length

A sigmoid shaped selectivity function. Based on two parameters <code>l25</code> and
<code>l50</code> which determine the length at which 25% and 50% of the stock is
selected respectively. As the size-based model is weight based, and this
selectivity function is length based, it uses the
length-weight parameters <code>a</code> and <code>b</code> to convert between length and weight.

A set of classes and methods to set up and run multi-species, trait
based and community size spectrum ecological models, focused on the marine
environment.

Gustav Delius

mizer

Dynamic Multi-Species Size Spectrum Modelling

Finlay Scott

Julia Blanchard

Ken Andersen

Richard Southwell

sigmoid_length function

<dl><dt>w</dt>
<dd>Vector of sizes.</dd>
<dt>l25</dt>
<dd>the length which gives a selectivity of 25%.</dd>
<dt>l50</dt>
<dd>the length which gives a selectivity of 50%.</dd>
<dt>species_params</dt>
<dd>A list with the species params for the current species.
Used to get at the length-weight parameters <code>a</code> and <code>b</code>.</dd>
<dt>...</dt>
<dd>Unused</dd></dl>

Arguments

Length based sigmoid selectivity function — sigmoid_length

<dl>

<dt>w</dt>
<dd>Vector of sizes.</dd>


<dt>l25</dt>
<dd>the length which gives a selectivity of 25%.</dd>


<dt>l50</dt>
<dd>the length which gives a selectivity of 50%.</dd>


<dt>species_params</dt>
<dd>A list with the species params for the current species.
Used to get at the length-weight parameters <code>a</code> and <code>b</code>.</dd>


<dt>...</dt>
<dd>Unused</dd>

</dl>

sigmoid_length: Length based sigmoid selectivity function

Description

Usage

Value

Arguments

See Also