why looping just save the last value of iteration

how to get all values of lse not only the last iteration?

function lse = ee_battery_lse_r(params)
% Cost function used by ee_battery_opt_m.m

% Copyright 2019 The MathWorks, Inc.

% Calculate and return sum of squares of the differences
%     load ee_battery_data.mat
%     ParsListMain = {'Vnom', 'R1', 'AH', 'V1', 'AH1'};
%     assignin('base','ParsList',ParsListMain(1:4));
ParsList = evalin('base', 'ParsList');
Pars = reshape([ParsList; cellstr(num2str(params'))'],1,[]);
battery_data  = evalin('base', 'battery_data');
v_data  = evalin('base', 'v_data');
idx_data = evalin('base', 'idx_data');
Model = evalin('base', 'Model');
lse = 0;
warning off
for idx = idx_data
    assignin('base', 'idx_data', idx);
    %         set_param([Model '/Battery'], Pars{:})
    for k=1:2:length(Pars)
        if regexp(Pars{k},'charge')
            evalin('base',['AH0=' Pars{k+1} ';'])
        else
            evalin('base',[Pars{k} '=' Pars{k+1} ';'])
        end
    end
    if ~max(contains(Pars,'charge')) && ~max(contains(Pars,'tau1'))
        AH = evalin('base', 'AH');
        assignin('base','AH0',AH*battery_data(idx).SOC0);
    end
    % Catch invalid parameters supplied by fminsearch
    try
        out = sim(Model);
        % Difference between block current output and data
        data_diff = out.Vo.signals.values-v_data;
        lse = lse + (data_diff'*data_diff);
        
    catch
        % For invalid parameters return a large function error
        lse = 1e5;
    end 
end
warning on
end

[Torsten]

The objective function of an optimizer must return one scalar cost value - and this value is "lse".

Answer 1

[Sulaymon Eshkabilov]

Because the indexes are missing, e.g.:

data_diff(??) = out.Vo.signals.values-v_data;
lse(??) = lse(??) + (data_diff'*data_diff);

Assign indexes to your output variables according to your set [for .. end] loop.

[Hend Mostafa]

i removed the indexes so that I can see the results in command window, but also after adding them, only the last value of lse is taken