get_SETTINGS(handles)

function SETTINGS = get_SETTINGS(handles)
% function to fetch some information from the gui, as input parameter for
% the function ivp_solve
%
% input:   o handles...object hanles from the main GUI
%
% output:  o SETTINGS...struct with parameters for the solve function
%
% notes:   o
%
% authors: o Christian Jkel (University of Technology Dresden)
%          o Daniel Klawitter (University of Technology Dresden)

SETTINGS.step = str2double(get(handles.stepsize,'String'));
% select method from listbox
methods = get(handles.methods,'String');
SETTINGS.method = methods(get(handles.methods,'Value'));
SETTINGS.calculate_region_of_stability = 0; % region of stability won't be calculated

% set function from string as function handle
eval(['SETTINGS.equation = @(x,y)',get(handles.equation,'String'),';']);
if get(handles.exakt_solution_known,'Value')
    eval(['SETTINGS.fu_exact = @(x)',get(handles.u_exact,'String'),';']);
end
% startpoint of the interval
SETTINGS.beginvalue = str2num(get(handles.beginvalue,'String'));
% endpoint of the intervall
SETTINGS.endvalue = str2num(get(handles.endvalue,'String'));
% startvalue for the ODE
SETTINGS.startvalue = str2num(get(handles.startvalue,'String'));

% Runge-Kutta-method or linear multistep method?
switch char(SETTINGS.method)
    case {'explicit Euler-method','Heun-Verfahren','Klassisches RKV','Dormand-Prince RKV','implicit Euler-method','Radau II RKV','Gau RKV','eigenesRKV'}
        SETTINGS.isRKV = 1;
    otherwise
        SETTINGS.isRKV = 0;
end

if strcmp(SETTINGS.method,'user defined method')
    % region of stability will be calculated
    SETTINGS.calculate_region_of_stability = 1; 
    
%     RESULT_USER_DEFINED_METHOD = user_defined_method;
    SETTINGS = user_defined_method(SETTINGS);   
    
    if SETTINGS.isRKV
        method_for_region_of_stability = 'eigenesRKV';
        stab_a = SETTINGS.c;
        stab_c = SETTINGS.B;
        stab_B = SETTINGS.a;
    else
        stab_rho = SETTINGS.rho;
        stab_sigma = SETTINGS.sigma;
        method_for_region_of_stability = 'eigenesMSV';
    end
end