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  "Title": "An R Interface to the 'ROPTLIB' Library for Riemannian Manifold\nOptimization",
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  "Description": "An R interface to version 0.3 of the 'ROPTLIB'\noptimization library (see <https://www.math.fsu.edu/~whuang2/>\nfor more information). Optimize real-valued functions over\nmanifolds such as Stiefel, Grassmann, and symmetric positive\ndefinite matrices. For details see Martin et al. (2020)\n<doi:10.18637/jss.v093.i01>. Note that the optional 'ldr'\npackage used in some of this package's examples can be obtained\nfrom either the article <doi:10.18637/jss.v061.i03> or from the\n'ldr' package <https://cran.r-project.org/package=ldr>.",
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        "Design of C++ code",
        "ManifoldOptim"
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      "title": "Get parameters to initialize numerical differentiation",
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        "get.lowrank.defn",
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