MATLAB: How to load text file ? delete some specific part of the text file and then write the remaining as it is into the text file

fopen

suppose the if input text file contains lines of characters as shown

inputfile.txt

12 4 5 678 6g4g4g5r6r7r9 
12 5 79 hghoojb iumkk
fhjk kjjjlk g2g3g5g4r5r7r8
12 4 80999b9 77908900
12 4 5 678 6g4g4g5r6r7r9

i need output file which has no characters after r for every specific line . like this

outputfile.txt

12 4 5 678 6g4g4g5
12 5 79 hghoojb iumkk
fhjk kjjjlk g2g3g5g4
12 4 80999b9 77908900
12 4 5 678 6g4g4g5
 please help me with this?

Best Answer

filecontent = fileread('inputfile.txt');
outcontent = regexprep( filecontent, 'r.*$', '', 'dotexceptnewline', 'lineanchors');
fid = fopen('outfile.txt', 'w');
fwrite(fid, outcontent);
fclose(fid);

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MATLAB: Manipulating text files

fi=fopen('YourFile.txt','r');
fo=fopen('outfile.txt','w');
txtcell=textscan(fi,'%s','delimiter','\n');
Str1Idx=1;
Str2Idx=68;
Str3Idx=82;
StrLen=86;
for i=1:length(txtcell{1})
    if(length(txtcell{1}{i})==StrLen)
        txtcell{1}{i}((Str3Idx):(Str3Idx+4))=txtcell{1}{i}((Str2Idx+2):(Str2Idx+6));
    end
    fprintf(fo,strcat(txtcell{1}{i},'\n'));
end
fclose(fi);
fclose(fo);

MATLAB: Merge specific text files

You will need two loops, the outer loop for M1, M2, etc, and the inner loop for the files R1,R2,R3,...R100, e.g.:

D  = 'path to the directroy where the files are saved';
Mn = 3;   % number of groups.
Rn = 100; % number of files in each group.
for Mk = 1:Mn % M1, M2, ...
    C = cell(1,Rn); % preallocate cell array for this group
    for Rk = 1:Rn % R1, R2, ... R100
        F = sprintf('M%u_mR%u.txt',Mk,Rk);
        C{Rk} = dlmread(fullfile(D,F))
    end
    M = vertcat(C{:}); % create one matrix from entire group
    F = sprintf('M%u_ALL.txt',Mk);
    dlmwrite(F,M) % save
end

Of course you do not have to use dlmread and dlmwrite: you can trivially change the file importing/exporting functions for something more suitable, or that you have a preference for, or that you think is fancier.

Note that this answer will actually concatenate the file data in the order R1,R2,R3,...R100.

Best Answer

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MATLAB: Manipulating text files

MATLAB: Merge specific text files

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