SciML/ModelingToolkit.jl

Differential Equation Function Transformations

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#141 opened on May 29, 2019

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good first issuetransform

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Description

Basic things like http://www.math.mcgill.ca/jakobson/courses/ma261/lecture5.pdf

This can really help enforce conditions like non-negativity since if your space doesn't allow it, then the numerical solver can guarantee it won't happen if it solves for exp(x) instead of x.

Contributor guide

Research direction
Study the symbolic transformation capabilities in ModelingToolkit.jl and implement a function transformation that replaces a variable with exp(variable) to enforce positivity. Inspect the existing source code for similar transformations and test with a differential equation solver.
Tech stack
julia
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JuliaSymbolic computationDifferential equations
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45