Converting float data to binary

Hello ,

I have a question about converting floating files to binary files of data suppose that I have a sin signal:

delta_f = 2; f_max = 10^4; fe = 10*f_max; N = fe/delta_f ;

t = (1:N)/ fe; sinus = sin(2*pi*t*10);

figure (1); plot (t,sinus,'r'); title('signal sinusoidale '); xlabel('temps'); ylabel('amplitude');

save it in a file

emplacement_fichier='c:\\test.txt'; fid=fopen(emplacement_fichier,'w'); fprintf(fid,'%s \t, %s\r\n',[t; sinus]); fclose(fid);

how can I creat an other file with all this value in an other file of course I think I have to add an offset for to get only positive values isn't it ?

thanks for your help

[Vivek Selvam]

Hi Sabeha, do you want to read back only the positive values from the file?

[Jan]

• "Floating files" is not clear.
• Please format your code to improve the readability.
• I do not see a connection to "binary files" in the description of the problem.
• Please do not post code, which does not have any relation to the problem. It does not matter if the data are a sinus or simply [-1, 0, 1].
• Why do you want to add any offset?

[Sabeha]

% déclarer un signal sinusodale classique 
delta_f = 2;
f_max   = 10^4;
fe = 10*f_max;
N  = fe/delta_f ;

t = (1:N)/ fe;
sinus = sin(2*pi*t*10);

figure (1); 
plot (t,sinus,'r');
title('signal sinusoidale ');
xlabel('temps'); 
ylabel('amplitude'); 

% reccuperer les  amplitudes du signal sinus 

emplacement_fichier='c:\\test.txt';

fid=fopen(emplacement_fichier,'w'); 
fprintf(fid,'%s \t, %s\r\n',[t; sinus]);
fclose(fid);

[Sabeha]

I just want to convert the generated file to a file with all the previous data in binary

[Walter Roberson]

Use fwrite() instead of fprintf()

[Sabeha]

I always have problem with fwrite

Error using fwrite
Invalid precision.

Error in Binaire (line 30)
fwrite(fid,'%s \t, %s\r\n',[t; sinus]);

[Walter Roberson]

fwrite() does not accept formats. You want to write in binary, correct? Binary is binary, format-less.

fwrite(fid, [t; sinus])

You do need to be careful about whether you want the binary file to be interleaved, one t then one sinus, another t another sinus, or if you want all the t then all the sinus. [t; sinus] would end up alternating the two.

[Sabeha]

I want the same columns one for t in binary and one for sin in binary to

[Walter Roberson]

Binary files do not have columns.