# spacepy.toolbox.intsolve

spacepy.toolbox.intsolve(func, value, start=None, stop=None, maxit=1000)

  Find the function input such that definite integral is desired value.

  Given a function, integrate from an (optional) start point until the integral reached a desired value, and return the end point of the integration.

  Parameters:
    func callable

      function to integrate, must take single parameter

    value float

      desired final value of the integral

    start float (optional)

      value at which to start integration, default -Infinity

    stop float (optional)

      value at which to stop integration, default +Infinity

    maxit integer

      maximum number of iterations

  Returns:
    out float

      x such that the integral of L{func} from L{start} to x is L{value}

    Note: Assumes func is everywhere positive, otherwise solution may

      be multi-valued.