MATLAB: How to read specified letters from ascii file

MATLABopen file

i want prgrm that reads ascii file but only the letters 'a' to 'z' using ascii code 97:122 and i want to put those letters in new file and save them

Best Answer

inputFileName = 'C:\input.txt';
outputFileName = 'C:\output.txt';
fileID = fopen(inputFileName,'r');
A = fread(fileID,'*char');
fclose(fileID);
A = A(A >= 97 & A <= 122); % using logical indexing to keep only 'a' to 'z'
fileID = fopen(outputFileName,'w');
fprintf(fileID,'%s',A);
fclose(fileID);

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MATLAB: Read from txt file

% Try this

 fid = fopen('words.txt', 'r'); 
 Data = fread(fid);
 CharData = char(Data);
 fclose(fid);
 disp(Data);
 fid = fopen('email.txt', 'r');
 Data = fread(fid);
 CharData = char(Data);
 fclose(fid);
 disp(Data);

If not works than what is the error..? Show it..

MATLAB: Editing a .c file using a .m file

Well, the pointer is at the beginning of the file and that's where the data is written. So the functions behave as they should.

If you wanted to attach some data at the end of the file, you could use the permission 'a+'. In case you want to extend the file at the beginning, I think you need to create an entire new file:

 readID=fopen('XYZ.c','r');
 writeID=fopen('NEW.c','w');
 fprintf(writeID,'%s\n','XYZ');
 fwrite(writeID,fread(readID));
 fclose(readID);
 fclose(writeID);

In principle, you can of course first read the file and then overwrite it (so both files are the same):

 fileID=fopen('test.txt','r+');
 data=fread(fileID);
 frewind(fileID);
 fprintf(fileID,'%s\n','XYZ');
 fwrite(fileID,data);
 fclose(fileID);
 edit test.txt

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MATLAB: Read from txt file

MATLAB: Editing a .c file using a .m file

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