# emulator v1.2-20

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## Bayesian Emulation of Computer Programs

Allows one to estimate the output of a computer program,
as a function of the input parameters, without actually running it.
The computer program is assumed to be a Gaussian process, whose
parameters are estimated using Bayesian techniques that give a PDF of
expected program output. This PDF is conditional on a training set
of runs, each consisting of a point in parameter space and the model
output at that point. The emphasis is on complex codes that take
weeks or months to run, and that have a large number of undetermined
input parameters; many climate prediction models fall into this
class. The emulator essentially determines Bayesian posterior
estimates of the PDF of the output of a model, conditioned on results
from previous runs and a user-specified prior linear model. A vignette is
provided and the help pages include examples.

## Functions in emulator

Name | Description | |

regressor.basis | Regressor basis function | |

results.table | Results from 100 Goldstein runs | |

makeinputfiles | Makes input files for condor runs of goldstein | |

optimal.scales | Use optimization techniques to find the optimal scales | |

pad | Simple pad function | |

model | Simple model for concept checking | |

sigmahatsquared | Estimator for sigma squared | |

scales.likelihood | Likelihood of roughness parameters | |

interpolant | Interpolates between known points using Bayesian estimation | |

OO2002 | Implementation of the ideas of Oakley and O'Hagan 2002 | |

estimator | Estimates each known datapoint using the others as datapoints | |

s.chi | Variance estimator | |

prior.b | Prior linear fits | |

sample.n.fit | Sample from a Gaussian process and fit an emulator to the points | |

quad.form | Evaluate a quadratic form efficiently | |

toy | A toy dataset | |

tr | Trace of a matrix | |

latin.hypercube | Latin hypercube design matrix | |

expert.estimates | Expert estimates for Goldstein input parameters | |

emulator-package | emulator | |

betahat.fun | Calculates MLE coefficients of linear fit | |

corr | correlation function for calculating A | |

No Results! |

## Vignettes of emulator

Name | ||

emulex.Rnw | ||

quad_form_test.Rmd | ||

uncertainty.bib | ||

No Results! |

## Last month downloads

## Details

Type | Package |

VignetteBuilder | knitr |

License | GPL |

URL | https://github.com/RobinHankin/emulator.git |

BugReports | https://github.com/RobinHankin/emulator/issues |

NeedsCompilation | no |

Packaged | 2019-03-19 19:20:27 UTC; rhankin |

Repository | CRAN |

Date/Publication | 2019-03-19 20:30:14 UTC |

suggests | knitr |

depends | mvtnorm , R (>= 3.0.1) |

Contributors |

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