Christopher Tessum

Observed variables are computed even when unused

10

**Describe the bug 🐞** I have a project that involves data loaders, basically reading large amounts of data from files and interpolating them into MTK models, for example here: https://data.earthsci.dev/stable/geosfp/....

Don't check units during initialization

1

...because initialization problems don't correctly handle units and units have already been checked during system initialization. ## Checklist - [X] Appropriate tests were added - [X] Any code changes were...

Fails to initialize with units

7

**Describe the bug 🐞** Systems don't seem to initialize properly if there are units. **Expected behavior** I would like to be able to run the system but it fails during...

Symbolic units don't work for equation with constant and variable

2

**Describe the bug 🐞** If an equation has a constant and a variable, both with symbolic units, it throws an error. **Expected behavior** There shouldn't be an error if the...

SplitODEProblem doesn't work with ForwardDiff in in-place mode.

1

**Describe the bug 🐞** I would like to use ForwardDiff to calculate the sensitivity of an ODE system using a split problem. It currently works with an out-of-place ODE function,...

switch parse_costs! and parse_constraints

5

It seems like they are currently backward

**Is your feature request related to a problem? Please describe.** We currently use system metadata for a number of different purposes, for example [here](https://base.earthsci.dev/dev/composition/#Model-Composition). We would also like to use...

**Describe the bug 🐞** Here is some code that creates a system with events and metadata, and then performs a substitution: ```julia using ModelingToolkit t = ModelingToolkit.t_nounits D = ModelingToolkit.D_nounits...

**Describe the bug 🐞** I have this unit test which worked in MTK v9.79 with a functional effect. However, when I update to MTK v10 and change it to an...

Float64 constants result in Float64 results

4

**Describe the bug 🐞** Currently, if a system has a constant in it (e.g. `@constants g = 9.8`), and the constant is defined as a float64 number, the result of...