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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MATH-797) Single step integrators
Date Thu, 31 May 2012 14:32:22 GMT
Gilles created MATH-797:
---------------------------

             Summary: Single step integrators
                 Key: MATH-797
                 URL: https://issues.apache.org/jira/browse/MATH-797
             Project: Commons Math
          Issue Type: Wish
    Affects Versions: 3.0
            Reporter: Gilles
            Assignee: Gilles
            Priority: Trivial
             Fix For: 3.1


CM assumes that the user wants to integrate a complex function on a large interval, so the
large interval has to be subdivided into many subintervals. CM does the partition, and performs
convergence checks, using an iterative approach.

However, if the function is smooth enough, no subdivision of the integration interval is required.
Those use-cases could benefit from the efficiency gain of not performing a convergence check.

The proposal is to provide a new interface "UnivariateSingleStepIntegrator":
{code}
interface SingleIntervalIntegrator {
    /**
     * Method for implementing a single interval integration.
     * There is no convergence checks because it is not iterative.
     *
     * @param f Function to integrate.
     * @param lower Lower bound of the interval over which to integrate.
     * @param upper Upper bound of the interval over which to integrate.
     * @return the integrated value.
     */
    double integrate(UnivariateFunction f,
                     double lower,
                     double upper);
}
{code}

In effect, the implementation of the above "integrate" method of a new "LegendreGaussIntegratorSingleStepIntegrator"
would the equivalent of "stage(1)" in the current "LegendreGaussIntegrator".


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