pastvalue: Retrieve Past Values (lags) During Gradient Calculation

In PBSddesolve: Solver for Delay Differential Equations

Retrieve Past Values (lags) During Gradient Calculation

Description

These routines provides access to variable history at lagged times. The lagged time t must not be less than t_0, nor should it be greater than the current time of gradient calculation. The routine cannot be directly called by a user, and will only work during the integration process as triggered by the dde routine.

Usage

pastvalue(t)
pastgradient(t)

Arguments

t	numeric – time t at which history is accessed

Value

Vector of variable history at time t.

Author(s)

Alex Couture-Beil – Software Engineer, Earthly Technologies, Victoria BC

Maintainer: Rowan Haigh, Program Head – Offshore Rockfish
Pacific Biological Station (PBS), Fisheries & Oceans Canada (DFO), Nanaimo BC
locus opus: remote office, Vancouver BC
Last modified Rd: 2025-06-13

See Also

In package PBSddesolve:
dde

PBSddesolve documentation built on Nov. 14, 2025, 5:07 p.m.