How to save signal as double in .dat file?

I need to save a signal generated in Matlab in a .dat file format as double precision floating point numbers. The purpose is so this file can be read from an executable I have written to transmit this data using a Software Defined Radio.

I can't seam to find anything online. Most commands that save the data seem to always save it in ASCII.

Thank you for the help

Answer 1

[Azzi Abdelmalek]

Use fwrite

[Christopher]

Thank you Aziz, I have tried this and wanted to verify that it worked as expected. When I try to recover the data I had saved using fread, I just get an empty matrix. For example after the file is created and saved I try to recover the data using B = fread(fid,N,'float'); Where N is the number of elements I wish to use, then I just get B = []. Am I just doing the fread incorrectly? If I don't specify a precession it reads ever number rounded to the nearest bit, i.e. reads 0 or 1 depending on whatever the number was closest to.

[Christopher]

Ignore my last comment. I solved the problem. Thank you.

Answer 2

[Christopher]

Problem solved. For anyone who may also be looking for an answer to this question this is exactly what I did:

    fid = fopen('samples','w'); % create file to write to

    A = [0.03 -0.67 0.789]         % arbitrary floating point numbers to test

    fwrite(fid,A,'float');         % Write to file as floating point numbers  

    fid = fopen('samples','r');    % open file for readin 

    B = fread(fid,3,'float')       % Read the floating point number

Sometimes I know I go looking for answers, and someone responds that they solved the problem but don't state how, so I left this for the next guy who runs into this problem, and comes looking for a concise answer.