OALTS
Optimal A-stable Linear Two-Step Method
References:
Syntax
integrator OALTS (1) [2]
# (1) int, unique integrator tag
# [2] double, spectral radius, default: 0.5
Remarks
This method is closely related to the Generalised-Alpha method (on first order ODEs). See the second reference for more details, also see 10.1016/j.compstruc.2017.08.013.
This method requires a fixed time step. The initial time step is used for time marching. For example,
set ini_step_size 1E-2
The fixed_step_size
command such as
set fixed_step_size true
is not required and this flag is always true
.
Accuracy Analysis
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