How Can I stored previous result with new or current result in same cell array?

function ImportFiredataButtonPushed(app, event)
%            app.selectedFireCode = app.FireExperimentListBox.Value;
            app.selected_fire_channel = app.FireChannelListBox.Value;
            Fire_data_X = {};
            Fire_data_Y = {};
            Fire_data_Z = {};
            

            for i = 1:length(app.All_data)
               folder_path = app.All_data(i).file.folder;
               for j = 1:length(app.selected_fire_channel)
                   
                   if contains(folder_path, app.selected_fire_channel{j})
                       % Find the corresponding folder path
                       channel_folder_path = fullfile(folder_path, 'channel');
                        channel_files = dir(channel_folder_path);
                        
                        
                       for k = 1:length(channel_files)
                            if ~channel_files(k).isdir % Check if it's a file, not a directory
                                 file_name = channel_files(k).name;

                                if endsWith(file_name, '.chn')
                                    continue; % skip the .chn file
                                end
                                channel_filepath = fullfile(channel_folder_path, file_name);
                                channel_text = fileread(channel_filepath);
 
                                for m = 1:numel(app.selected_fire_list)
                                    if contains(channel_text,  app.selected_fire_list{m})
                                        direction = app.selected_fire_list{m}(15); 
                                        if ismember(direction, ['X', 'Y', 'Z']) 
                                            % Add the data to the appropriate array based on direction
                                            switch direction
                                                case 'X'
                                                    Fire_data_X{end+1} = read_chn(app, channel_filepath);
                                                case 'Y'
                                                    Fire_data_Y{end+1} = read_chn(app, channel_filepath);
                                                case 'Z'
                                                    Fire_data_Z{end+1} = read_chn(app, channel_filepath);
                                                          
                                            end
                                        end
                                    end  
                                end
                            end
                       end      
                   end
               end
            end
 
            assignin('base','Fire_data_X',Fire_data_X);
            assignin('base','Fire_data_Y',Fire_data_Y);
            assignin('base','Fire_data_Z',Fire_data_Z)
end

Hello,

I wrote this code to extract data from "app.selected_fire_list" which list of text file. "app.selected_fire_channel" this is the channel folder name list and each folder has multiple fire text file list. By clicking button, I am getting data it will extract data from selected fire list give me data in Fire_data_X, Fire_data_Y, and Fire_data_Z. What I want is that I have data in my workspace in Fire_data_X, Fire_data_Y, and Fire_data_Z by selecting files from "app.selected_fire_list" but If I select different channel folder name from "app.selected_fire_channel" then it give me new data in Fire_data_X, Fire_data_Y, and Fire_data_Z and old one is automatically removed from the cell. But I want both result like old and new if I select different channel folder multiple time then it just add the new result with old rsults in the cell. Could anyone know how I can do that?

Answer 1

[Voss]

Instead of initializing to empty the variables you plan to populate in the base workspace, try to get them from the base workspace first so that the new elements will be appended to the existing variables.

try
    % get variable from base workspace, if it exists
    Fire_data_X = evalin('base','Fire_data_X');
catch
    % if variable doesn't exist in base workspace, create an empty one here
    Fire_data_X = {};
end

try
    Fire_data_Y = evalin('base','Fire_data_Y');
catch
    Fire_data_Y = {};
end

try
    Fire_data_Z = evalin('base','Fire_data_Z');
catch
    Fire_data_Z = {};
end

Then the rest of your code is the same: run your loops to populate those variables with new elements, and assign the results in the base workspace. At the end, the variables in the base workspace will have whatever they had before plus the new stuff.