MATLAB: Read a file upto certain character

text file

Hello I have a file which contains 1342400 bits means 10101010010……like this way,

I need to read this file upto 1341440 bits ,how to do so?

after this I need to take chunk of 8bit from this bit sequence and have to convert it in decimal value,separated by ,

like 11111111111111111111111…. i need to convert it in 255,255,255 this way

any help for my two queries

Best Answer

Joy

 What u can do is...say ur given data set is in a file name test.txt where it has 26 characters..

do the following

txt=filered(test.txt);% now txt variable has all ur 26 chars,but u need first 16
so
new_txt=txt(1:16);

simple

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MATLAB: Can i do this program in matlab

Hi joy,

Your question is a bit unclear. It sounds like you are trying to do two different things: 1) You want to write a new text file that inserts spaces between every set of 8 bits, and 2) You want to convert the binary strings into decimals.

First the former-- the easiest way to do this is just to read the text file into Matlab, arrange the matrix into groups of 8, and write a new file. Like this:

txt = fileread('/path/to/your/file.txt');   %read original file to string
n = 8*ceil(length(txt)/8);     %number of characters to pad txt variable
txt(end:n)= ' ';    %pad to set length to be a multiple of 8
Txt = reshape(txt', 8, [])';   %reshape
Txt(:,end+1)=' ';    %add a space after each set of 8 characters
TT = reshape(Txt', 1, []);   %convert back to a vector
%now write string to new file
fid = fopen('/path/to/new/file.txt', 'wt');
fprintf(fid, '%s', TT); 
fclose(fid);

MATLAB: Writing newline to binary file with 16-bit Unicode

The problem is that you opened in text mode when you specified 'wt' -- the 't' part means text. Text mode is required to translate newline to carriage return followed by newline. Use 'w' instead of 'wt' to disable that.

Best Answer

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MATLAB: Can i do this program in matlab

MATLAB: Writing newline to binary file with 16-bit Unicode

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