//// Struct SumErrSqRadialPeak// A simple expression computing the sum of all peak errors (given as// first and second argument) for a range of peaks (third argument and fourth argument)// according to//// \f[// result = \frac{1}{n} * \sqrt{\sum_{i=start}^end (measurement_i - value_i)^2}// \f]//// Copyright (c) 2017 - 2018, Matthias Frey, Paul Scherrer Institut, Villigen PSI, Switzerland// All rights reserved//// Implemented as part of the PhD thesis// "Precise Simulations of Multibunches in High Intensity Cyclotrons"// and the paper// "Matching of turn pattern measurements for cyclotrons using multiobjective optimization"// (https://doi.org/10.1103/PhysRevAccelBeams.22.064602)//// This file is part of OPAL.//// OPAL is free software: you can redistribute it and/or modify// it under the terms of the GNU General Public License as published by// the Free Software Foundation, either version 3 of the License, or// (at your option) any later version.//// You should have received a copy of the GNU General Public License// along with OPAL. If not, see <https://www.gnu.org/licenses/>.//