# Integral Problems

SciMLBase.IntegralProblemType

Defines an integral problem. Documentation Page: https://github.com/SciML/Integrals.jl

Mathematical Specification of a Integral Problem

Integral problems are multi-dimensional integrals defined as:

$$$\int_{lb}^{ub} f(u,p) du$$$

where $p$ are parameters. u is a Number or AbstractArray whose geometry matches the space being integrated.

Problem Type

Constructors

IntegralProblem{iip}(f,lb,ub,p=NullParameters(); nout=1, batch = 0, kwargs...)

• f: the integrand, dx=f(x,p) for out-of-place or f(dx,x,p) for in-place.
• lb: Either a number or vector of lower bounds.
• ub: Either a number or vector of upper bounds.
• p: The parameters associated with the problem.
• nout: The output size of the function f. Defaults to 1, i.e., a scalar integral output.
• batch: The preferred number of points to batch. This allows user-side parallelization of the integrand. If batch != 0, then each x[:,i] is a different point of the integral to calculate, and the output should be nout x batchsize. Note that batch is a suggestion for the number of points, and it is not necessarily true that batch is the same as batchsize in all algorithms.
• kwargs:: Keyword arguments copied to the solvers.

Additionally, we can supply iip like IntegralProblem{iip}(...) as true or false to declare at compile time whether the integrator function is in-place.

Fields

The fields match the names of the constructor arguments.