def eval_form(q, form, pars):
    """
    Return the SAS model evaluated at *q*.

    *form* is the SAS model returned from :fun:`core.load_model`.

    *pars* are the parameter values to use when evaluating.
    """
    from sasmodels import direct_model
    kernel = form.make_kernel([q])
    theory = direct_model.call_kernel(kernel, pars)
    kernel.release()
    return theory
