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  "Description": "Tools for checking that the output of an optimization\nalgorithm is indeed at a local mode of the objective function.\nThis is accomplished graphically by calculating all\none-dimensional \"projection plots\" of the objective function,\ni.e., varying each input variable one at a time with all other\nelements of the potential solution being fixed.  The numerical\nvalues in these plots can be readily extracted for the purpose\nof automated and systematic unit-testing of optimization\nroutines.",
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        "optimCheck"
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      "title": "Elementwise difference between potential and optimal solutions.",
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        "diff.optrefit",
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        "diff.summary.optproj",
        "diff.summary.optrefit"
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        "Example: Quadratic Objective Function",
        "Visual Checks with optim_proj()",
        "Quantification of Projection Plots",
        "optim_refit(): A Numerical Alternative to Projection Plots",
        "Future Work: Constrained Optimization"
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