MATLAB: How to bypass a directory that is not exist

directoryloadmergesave

My experiment contains my subjects data and each subject consists of different blocks, before I do the analysis I need to merge my data into one mat file, so first I need to load all of the data, but the problem is some of my subjects have missing blocks and when my codes want to read all data, It crashes and said ''Unable to read file 'Subject 1 Block 3.mat'. No such file or directory'' , so I need to bypass the data that their directory doesn't exist, so I wrote this if statement inside my code but it didn't work:
%load data
s_Initial = 1;
s_Final = 100;
B_Initial = 1;
B_Final = 3;
% merging Data
Subjects_ID = [];
Block_ID = [];
% merge Data
for subject_Counter = s_Initial: s_Final
    for block_Counter = B_Initial: B_Final
        % load the directory name
        load_Data = fullfile(append('Subject', ' ',num2str(subject_Counter),...
            ' ', 'Block',' ',num2str(block_Counter),'.mat'));
        if class(load_Data) == 'char'
             all_Subjects(block_Counter, subject_Counter) = load(load_Data);
        else 
             break ;
        end
        Subjects_ID = [Subjects_ID; subject_Counter];
        Block_ID = [Block_ID; block_Counter];
    end
end
save('all_Subjects')

Best Answer

See exist() function https://www.mathworks.com/help/releases/R2020a/matlab/ref/exist.html. Call it with with search type 'file'
if exist(load_Data, 'file')
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