MATLAB: How to merge two strings

merge strings

I would like to load multiple files in a loop. Is it possible to merge strings as follows:

subjects=cell(19,1);
subjects{1}='s1';
subjects{2}='s2';
subjects{3}='s3';
subjects{4}='s4';
...
file_end='_stimulus1.mat';

I would need to merge subjects{i} and file_end to get:

data = load('s1_stimulus1.mat')
...

Thanks already in advance!

-Maria

Best Answer

One way:

for k1 = 1:size(subjects,2)
    fname = [subjects{k1} file_end]
    load(fname)
end

Related Solutions

MATLAB: How to process files of a particular order in MATLAB

"Possibly what is the error, it says that File doesn't exist."

Most likely the files do not exist in the location where you are trying to read them from, or the filenames are incorrect.

For example, your first example name starts with "Sub1..." but at the start of your code you have a cell array named Subjects where the first name is "Sub 01". Those are two very different name formats. No one here can tell you which one is correct. You have to know exactly what the name format is, and create names that match them exactly.

I wouldn't use a loop for the sessions, just the subjects. Perhaps something like this:

P = 'path to the folder where the files are saved'; % .e.g 'C:\MyProject\Data'
N = total number of subjects; % e.g. 3
for k = 1:N
    F1 = fullfile(P,sprintf('Sub%u_S1_Epochs.mat',k));
    F2 = fullfile(P,sprintf('Sub%u_S2_Epochs.mat',k));
    S1 = load(F1); % LOADing into a structure is more reliable.

    S2 = load(F2); % LOADing into a structure is more reliable.
    % ... Do whatever with data in S1 and S2.
end

MATLAB: How to bypass empty fields in structure when loading data

Use isstruct(): https://www.mathworks.com/help/releases/R2020a/matlab/ref/isstruct.html. For example, use the following if condition to only access data of it is a struct

if isstruct(all_Subjects(block_Counter, subject_Counter).all_results)
    reactionTime =  all_Subjects(block_Counter, subject_Counter).all_results.reactionTime;
    subject_Performance =  all_Subjects(block_Counter, subject_Counter).all_results.performance;
else
    reactionTime =  0; % or something else
    subject_Performance = 0;
end

Best Answer

Related Solutions

MATLAB: How to process files of a particular order in MATLAB

MATLAB: How to bypass empty fields in structure when loading data

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