xptr_create

This function is used in the <code>itp</code> package to
create external pointers to the C++ functions used as examples to
illustrate the use of the function <code>itp</code>. These pointers are
passed as the argument <code>f</code> to <code>itp</code>. To create their own
examples the user will need to create their own C++ function(s) and a
function that is similar to <code>xptr_create</code>.

Implements the Interpolate, Truncate, Project (ITP) root-finding
algorithm developed by Oliveira and Takahashi (2021) <doi:10.1145/3423597>.
The user provides the function, from the real numbers to the real numbers,
and an interval with the property that the values of the function at its
endpoints have different signs. If the function is continuous over this
interval then the ITP method estimates the value at which the function is
equal to zero. If the function is discontinuous then a point of
discontinuity at which the function changes sign may be found.
The function can be supplied using either an R function or an external
pointer to a C++ function. Tuning parameters of the ITP algorithm can be
set by the user. Default values are set based on arguments in Oliveira and
Takahashi (2021).

Paul Northrop

The Interpolate, Truncate, Project (ITP) Root-Finding Algorithm

xptr_create function

<dl><dt>fstr</dt>
<dd>A string indicating the C++ function required.</dd></dl>

Arguments

Create an external pointer to a C++ function — xptr_create

<dl>

<dt>fstr</dt>
<dd>A string indicating the C++ function required.</dd>

</dl>

xptr_create: Create an external pointer to a C++ function

Description

Usage

Value

Arguments

Details

See Also

Examples