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Implements diag_vec which converts a vector of size n into an n×n diagonal matrix. Includes forward pass, Jacobian, and Hessian computations. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Use standard CSR building pattern (J->p[row] = nnz) - Use next_diag counter instead of checking row == child_row * (n+1) - Simplify eval_jacobian to O(n) loop computing out_row directly Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Adds the diag_vec atom.