MATLAB: Binary into matlab workspace

binary into matlab workspace

I have a large number of bin files that I'm converting and importing the data into the matlab workspace into variable X for processing. Data is a column of numbers.

X=convert(i,pwd);

convert is a function which converts binary files in pwd directory and pulls out column i from each file and concatenates and puts into X.

What I'd like to do is

when length(X) = length(files(pwd)/2; or some value set by me

Create X1=convert(i,pwd); <– but start i where X left off and not from begining of bin file. And so on for X2

So Id like to basically split X into X1 X2 …. which are individually small enough to fit into memory and then process them.

If I could somehow pause the execution and redirect where convert stores data without disturbing anything else.

Best Answer

Sorry, you are going to have to "disturb" your code interface to handle that. For example, you could have convert() output a second output that was the ftell() value of the place it left off reading, and convert() could take an second input that would be a maximum length, and a third input that would be an fseek() position to start from.

Putting the length constraint to the actual reading should not be difficult; there is an optional size parameter for fread().

Related Solutions

MATLAB: Saved data from Matlab gets corrupted

The reason why it's wrong is explained by Walter Roberson.

What you can do to probably get your intended result is to use

fprintf

instead of

fwrite

Then you can write your data to the file in text format instead of binary format.

MATLAB: Function

Baba, variables created inside a function are limited to that function's scope. If you want to have DATA available outside the function, you should make that function return the DATA variable:

function DATA = getchan(wd)
% Search for .bin files in the wd directory
files = dir(fullfile(wd,'*.bin'));
DATA=[];
% Loop over every .bin file and build up DATA
for i=1:length(files)
    % Make sure we're reading from the wd directory
    d = readbin (fullfile(wd,files(i).name));
    % Append the first column of what we read to DATA
    DATA=[DATA; d(:,1)];
end
end

Now you can simply call:

MY_DATA = getchan(pwd)

Note above that I've also used "fullfile", passing in "wd" from your function to make your function work specifically on the directory stored in "wd".

Best Answer

Related Solutions

MATLAB: Saved data from Matlab gets corrupted

MATLAB: Function

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