User Interface Issues

[jerryfung110]

1. Lack of Expression Support:

ExaModels does not support expressions like JuMP, requiring users to input long and complicated expressions simultaneously, making it unfriendly.

2. Iteration Limitation:

ExaModels cannot iterate a variable based on another variable within objective functions or constraints, expression cannot be represented concisely.

3. Array Indexing Issue:

Arrays not generated by ExaModels.variable() cannot be indexed directly in objective functions and constraints. Attempting to do so results in errors like an invalid index: ExaModels.ParIndexed, because ExaModels creates an ExaModels.ParIndexed object instead of an Int, causing indexing issues.

4. Unclear Indexing in Constraints:

The indexing syntax in constraint! is unclear, which can lead to confusion and errors in defining constraints when users try to add expressions in constraint!