Places zeros to the left of a string. If the string
consists only of digits 0-9, <code>pad()</code> does not change the value of
the string if interpreted as a numeric.

array

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.  The
package includes functionality to evaluate quadratic forms
efficiently.

Robin K S Hankin

emulator

Bayesian Emulation of Computer Programs

pad function

<dl> <dt>x</dt>
<dd>Input argument (converted to character)</dd> <dt>len</dt>
<dd>Desired length of output</dd> <dt>padchar</dt>
<dd>Character to pad x with, defaulting to &#8220;0&#8221;</dd> <dt>strict</dt>
<dd>Boolean variable governing the behaviour when length of
 <code>x</code> is less than <code>len</code>. Under these circumstances, if
 <code>strict</code> takes the default value of <code>TRUE</code>, then
 return an error; if <code>FALSE</code>, return a truncated version of <code>x</code>
 (least significant characters retained)</dd></dl>

Arguments

Author

Simple pad function — pad

<dl>

 <dt>x</dt>
<dd>Input argument (converted to character)</dd>

 <dt>len</dt>
<dd>Desired length of output</dd>

 <dt>padchar</dt>
<dd>Character to pad x with, defaulting to &#8220;0&#8221;</dd>

 <dt>strict</dt>
<dd>Boolean variable governing the behaviour when length of
 <code>x</code> is less than <code>len</code>. Under these circumstances, if
 <code>strict</code> takes the default value of <code>TRUE</code>, then
 return an error; if <code>FALSE</code>, return a truncated version of <code>x</code>
 (least significant characters retained)</dd>

</dl>

pad: Simple pad function

Description

Usage

Arguments

Author

Examples