rk4sys

Fits a state-space mass-balance model for marine ecosystems,
which implements dynamics derived from
'Ecopath with Ecosim' <https://ecopath.org/>
while fitting to time-series of fishery catch, biomass indices,
age-composition samples, and weight-at-age data. Package
'ecostate' fits biological parameters (e.g., equilibrium mass)
and measurement parameters (e.g., catchability coefficients)
jointly with residual variation in process errors, and can include
Bayesian priors for parameters.

James Thorson

ecostate

State-Space Mass-Balance Model for Marine Ecosystems

rk4sys function

<dl><dt>f</dt>
<dd>function in the differential equation \(y' = f(x, y)\);
defined as a function \(R \times R^m \rightarrow R^m\), where \(m\) is the number of equations.</dd>
<dt>a</dt>
<dd>starting time for the interval to integrate</dd>
<dt>b</dt>
<dd>ending time for the interval to integrate.</dd>
<dt>y0</dt>
<dd>starting values at time <code>a</code></dd>
<dt>n</dt>
<dd>the number of steps from a to b.</dd>
<dt>Pars</dt>
<dd>named list of parameters passed to f</dd>
<dt>...</dt>
<dd>additional inputs to function <code>f</code></dd></dl>

Arguments

Classical Runge-Kutta for system of equations — rk4sys

<dl>

<dt>f</dt>
<dd>function in the differential equation \(y' = f(x, y)\);
defined as a function \(R \times R^m \rightarrow R^m\), where \(m\) is the number of equations.</dd>


<dt>a</dt>
<dd>starting time for the interval to integrate</dd>


<dt>b</dt>
<dd>ending time for the interval to integrate.</dd>


<dt>y0</dt>
<dd>starting values at time <code>a</code></dd>


<dt>n</dt>
<dd>the number of steps from a to b.</dd>


<dt>Pars</dt>
<dd>named list of parameters passed to f</dd>


<dt>...</dt>
<dd>additional inputs to function <code>f</code></dd>

</dl>

rk4sys: Classical Runge-Kutta for system of equations

Description

Usage

Value

Arguments

Details