Create a binary array with any dimension

Hello,

I need to save a .mat variable that has 226 rows and 301 columns in a .bin binary file. What is the way to do this?

Answer 1

[Adam Danz]

Use fwrite()

https://www.mathworks.com/help/matlab/ref/fwrite.html

[Guilherme Preisser]

I tried using this command, but it was saved as vector

[Adam Danz]

I don't know what you mean by "I got one". Could you provide the relevant code and a small sample of the data you want to save?

[Stephen23]

"I tried using this command, but it was saved as vector"

All files are sequential bytes of data. What do you expect to get?

[Guilherme Preisser]

The command I used was this:

fileID = fopen( 'binary.bin' , 'w' );

fwrite (fileID,idx)

fclose (fileID)

The variable idx is a logical array with the dimensions mentioned above. What I want is to save this variable in a binary file. But when I used this command, the binary file was saved as vector.

[Adam Danz]

As Stephen mentioned, this is how a binary file works. Here's an example.

Here we create a matrix and save it to a binary file.

fileID = fopen('MyMatrix.bin','w');
myMat = magic(3)
myMat =
    myMat =
     8     1     6
     3     5     7
     4     9     2
fwrite(fileID,myMat);
fclose(fileID);

And now we read it back into matlab and see that it's a columnar vector.

fileID = fopen('MyMatrix.bin');
myMat = fread(fileID)
myMat =
     8
     3
     4
     1
     5
     9
     6
     7
     2

If you know what size the matrix should be, use reshape.

     myMat = reshape(myMat, 3,3)