matlab-modernize-codelisted

# Code Modernization Replace deprecated MATLAB functions and anti-patterns with modern equivalents. This skill is the resolver — `check_matlab_code` is the detector. ## When to Use - `check_matlab_code` or `checkcode` returns "not recommended" or "to be removed" warnings - User asks to modernize, migrate, or update old MATLAB code - Code uses functions listed in the quick reference table below - After static analysis reveals deprecated API usage - Writing new code in a domain that has known deprecated patterns ## When NOT to Use - Reviewing code quality broadly — use `matlab-review-code` (which may then trigger this skill) - Debugging runtime errors — use `matlab-debugging` - Performance profiling — use performance skills (though anti-patterns below overlap) ## Quick Reference: Top Deprecated Functions | Deprecated | Use instead | Since | Category | |------------|------------|-------|----------| | `csvread` / `dlmread` | `readmatrix` | R2019a | File I/O | | `csvwrite` / `dlmwrite` | `writematrix` | R2019a | File I/O | | `xlsread` | `readtable`, `readmatrix` | R2019a | File I/O | | `xlswrite` | `writetable`, `writematrix` | R2019a | File I/O | | `datenum` / `datestr` | `datetime` | R2014b | Date/Time | | `subplot` | `tiledlayout` / `nexttile` | R2019b | Graphics | | `eval` / `evalc` / `evalin` | Dynamic field names, function handles | — | Security | | `str2num` | `str2double` | — | Security | | `trainNetwork` | `trainnet` | R2024a | Deep Learning | | `LayerGraph` / `Ser