Write binary number to text file [MATLAB]

Question

I want to create an input file with random 8 bit binary number for VHDL testbench using Matlab.

%create random 10 decimal number
a = randi ( [0 255], 10 , 1 ); 
display(a);
%convert to 8bit binary
a=dec2bin(a,8);
display(a); 
%write to textfile
fid=fopen('eventsIn.txt','wt'); 
fprintf(fid,'%s\n',a); 
fclose(fid);

how i want to make sure that the output become

instead of this format?

10101001100100001010001111010000110010011110111000101011101101101110100100100010

Did you open it with note pad or notepad++? Or anyother depending on OS. — Vuwox
– Vuwox, Commented Nov 29, 2013 at 13:40
I'm using windows and have tried both notepad and notepad++..but still give a single line output — khairul
– khairul, Commented Nov 29, 2013 at 14:00
possible duplicate of writing binary values into file in MATLAB — Dennis Jaheruddin
– Dennis Jaheruddin, Commented Nov 29, 2013 at 14:33

Luis Mendo · Accepted Answer · 2013-11-29 15:20:31Z

0

You can do it with your approach, only changing two things:

If each row of a is a number which should be written in a different line, you should transpose a before feeding it to fprintf. That's because fprintf(fid,'%s\n',x) reads first column of x, then second column etc.
Add a carriage return (ASCII code 13) or line feed (ASCII code 10) or both at the end of each column of a.' (that is, in a new row or two new rows). And as a side result you don't need the \n in the format string of fprintf.

So, use

fprintf(fid, '%s', [ a.'; repmat(char(13), 1, size(a,1)) ] ) %// CR only

or

fprintf(fid, '%s', [a.'; repmat(char([10; 13]), 1, size(a,1))] ) %// LF and CR

edited Nov 29, 2013 at 15:20

answered Nov 29, 2013 at 15:14

Luis Mendo

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3 Comments

A. Donda Over a year ago

Hm, but this way you end each line with a CR, and at the very end you have an additional LF?!

Luis Mendo Over a year ago

@A.Donda Thanks, now I see what you mean. I have removed \n from the format string

Luis Mendo Over a year ago

@khairul Please consider marking one of the answers as "accepted", if it does what you want

Dennis Jaheruddin · Accepted Answer · 2013-11-29 14:31:06Z

0

EDIT

First try this:

dlmwrite('output.txt', b, '')

What you currently seem to do is writing all data and then appending a newline.

There are several ways to deal with this. This is a simple one:

Do your writing in a for loop over the lines and append a newline after each line.

If that still doesn't work you can try using \r\n instead of \n.

answered Nov 29, 2013 at 14:31

Dennis Jaheruddin

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Comments

A. Donda · Accepted Answer · 2013-11-29 15:15:35Z

0

Your a is a two-dimensional character array, that you would like to be interpreted as a sequence of strings. However, fprintf(fid,'%s\n',a) just handles it as one big string. As Dennis Jaheruddin writes, there are several ways to achieve this. I think this one's pretty simple:

Convert the two-dimensional character array into a cell array of strings:

a = cellstr(a);

Feed it to fprintf as an (implicit) sequence of arguments:

fprintf('%s\n', a{:})

This way, you don't need to program a loop.

answered Nov 29, 2013 at 15:15

A. Donda

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