How to save a matrix from the workspace to my computer as a dat file?

Question

Tamer Kaya 2022-5-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1727005-how-to-save-a-matrix-from-the-workspace-to-my-computer-as-a-dat-file

评论： Tamer Kaya 2022-6-23

Hello everyone, I am quite new to Matlab world and having some issues running my code. With the code I attached below, I am capable of creating the matrix I want to, and see it in the workspace. However when I want to save that matrix as raw binary int16 dat file to my desktop, I am having constant errors. Can someone help me out with that?

% get maximal number of files in directory

nfiles= 64

fileinfo = dir ("amp-A-000.dat");

num_samples = fileinfo.bytes/2; % int16 = 2 bytes

DATA=int16(zeros(num_samples, nfiles)); %empty matrix for all data

file_prefix = "amp-A-";

file_ext = ".dat";

for file_num = 0 : 63

file_num_str = num2str(file_num);

if file_num < 10

file_num_str = strcat("00", file_num_str);

elseif file_num >= 10 && file_num < 100

file_num_str = strcat("0", file_num_str);

end

file_name = strcat(file_prefix, file_num_str, file_ext);

fid = fopen(file_name, "r"); %here the expression amp-A-000 has to be made automatically into amp-A-(000)k

DATA(:,file_num+1)= fread(fid, num_samples, "int16");

fclose(fid);

end

%save a new binary file with ending *.dat

DATA = DATA';

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Jan 2022-5-25

编辑：Jan 2022-5-25

在 MATLAB Online 中打开

Avoid such complicated inserting of zeros:

file_prefix = "amp-A-";
file_ext = ".dat";
file_num_str = num2str(file_num);
if file_num < 10
    file_num_str = strcat("00", file_num_str);
elseif file_num >= 10 && file_num < 100
    file_num_str = strcat("0", file_num_str);       
end
file_name = strcat(file_prefix, file_num_str, file_ext);

by

file_name = sprintf('amp-A-%03d.dat', file_num);

How do you try to save the file and which errors do you get?

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Answer 1

Jan 2022-5-25

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1727005-how-to-save-a-matrix-from-the-workspace-to-my-computer-as-a-dat-file#answer_971550

在 MATLAB Online 中打开

folder = 'D:\Your\Outputfolder';
file   = fullfile(folder, 'yourFile.dat');
[fid, msg] = fopen(file, 'W');
assert(fid > 0, msg);
fwrite(fid, Data, 'int16');
fclose(fid);

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Tamer Kaya 2022-6-23

Thank you so much Jan, and sorry for my very late answer. After creating the matrix, I was directly trying to fwrite without providing enough input arguments probably. Now it works perfectly!

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