How to write to in MATLAB, translated from R

I have the following R code of 'string replace and write to' but it could not be recognized when running in terminal. So need to write to MATLAB code.

input: subj001_script.m containing character of subj001
output_expected: output/subj001_script.m containing subj001 
                 output/subj002_script.m containing subj002 
                 output/subj003_script.m containing subj003 
                 output/subj004_script.m containing subj004 

%% array of ids 
ids=data.frame("V1"=c("subj001", "subj002", "subj003", "subj004"))
%% sample script for subj001
txt2 <- readLines("subj001_script.m")   
%% replace subj001 with ids and write to 
for (i in ids$V1){
    writeLines(gsub("subj001", i, txt2), paste0("output/", i, "_script.m"))
    }

What I did is so far is below and I don't know if there is a function that can "paste0" for naming in MATLAB code?

    line='subj001'+"\n"+'subj002'+"\n"+"subj003"+'\n'+'subj004';
    file= compose(line);
    ids=strsplit(file);
    txt2=fileread("subj001_script.m");
    for i =ids
        fprintf(strrep(txt2,"subj001", i), ???? ("output/", i, "_script.m"))
    end

[Image Analyst]

Why do you need to call strsplit()? The strrep should be able to work on "file" (the whole, entire file contents).

Attach "list.txt" if you need any more help, after reading this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

Answer 1

[the cyclist]

String concatenation in MATLAB can be done as "addition":

i = 7;
"output/" + i + "_script.m"

ans = "output/7_script.m"

Answer 2

[qi zeng]

I clear my chrome cache and I still cannot comment above, so

@Image Analyst: I mimic the way the fileread(ids.txt) with the above lines. As the ids are read in as a string not an array, I split the string later

@the cyclist: but how to combine your codes with "fprintf" or maybe "fprintf" isnot the best option to write to multiple files at the same time? can you be more specific?

[the cyclist]

I couldn't figure out what either your R code or your MATLAB attempt was doing, which is why I answered only that small question about paste0().

Answer 3

[Image Analyst]

Your post was so confusing that I don't know what pattern should be replaced by what other desired pattern. But it might go something like this:

% Read input file.
inputLines = readlines(inputFileName);
numLines = numel(inputLines)
outputLines = cell(numLines, 1);
% Loop over every line replacing *something* with *something else* -
% whatever those might be.
for k = 1 : numel(inputLines)
    % Replace inputPattern withdesiredPattern
    outputLines{k} = strrep(inputLines{k}, inputPattern, desiredPattern);
end
% Write output file.
writelines(outputLines, outputFileName);

Make the proper adaptations like defining the input and output patterns.