SciML/OrdinaryDiffEq.jl

DAE initialization default tolerances

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#1038 opened on Feb 18, 2020

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DAEeasyhelp wanted

Description

We should have a setup so that way the DAE initialization algorithm's default tolerances match those from solve. That would require a setup for delayed tolerance changes.

Contributor guide

Tech stack
None
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Julia programmingDAE solver basicsOrdinaryDiffEq.jl internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Explore the current tolerance handling in the DAE initialization algorithm within the OrdinaryDiffEq.jl source code. Specifically, examine the `solve` function's default tolerance mechanism and how it is currently set up for ODE solvers, then devise a similar setup for DAE initialization that allows delayed tolerance changes. Look at relevant files in the repository, such as those in the `src/` directory related to DAE solvers, and consider any existing tests for tolerance propagation.