This R package contains some general utilities that I and maybe others find useful when developing data science software:
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calculating density values
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catching exceptions
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working with Cholesky roots
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differencing covariance matrices
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working with dates
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creating a dictionary
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working with functions and their arguments
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estimating hidden Markov models
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working with indices
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working with lists
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creating Markov chains
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helpers for building an R package
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sampling from densities
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timed evaluations
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user interactions