Problem in opening and Reading a Binarydata file ??

% Here is the code for opening the and reading the data file 
file='dspCW2datav2.bin';
fid=fopen(file,'r'); %%%%%% fid= -1 ????
format='double';
data=fread(fid,format);% Reading the binary data in the matlab

So , every time running this , i get an error for using fread . But i now figured out that's happening because fid = -1 , hence this is leading to error in fread .

The error is as follows!!

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Error using fread

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in suvvi_20201366 (line 21)

data=fread(fid,format);% Reading the binary data in the matlab

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Can someone please help me in getting rid of this error ????

Thankyou,

suvvi

Answer 1

[Image Analyst]

The file does not exist or exists in an area that you're not allowed to see. Try this

% Here is the code for opening the and reading the data file 
fileName = 'dspCW2datav2.bin';
fid=fopen(fileName, 'r'); %%%%%% fid= -1 ????
if fid == -1
    errorMessage = sprintf('You are not allowed to open %s.\nIt was not found on the search path.', fileName);
    uiwait(errordlg(errorMessage));
    return;
end
format='double';
data=fread(fid,format);% Reading the binary data in the matlab

[Suvvi Kuppur Narayana Swamy]

Thank you ,this worked

Answer 2

[Mario Malic]

fileID = fopen('dspCW2datav2.bin');
A = fread(fileID)

Never tried opening bin files, but this should be working. Function fread does not accept the "format" variable, as you can see from documentation.

[Suvvi Kuppur Narayana Swamy]

No its not working .fileID still is -1 . Im sure as long as it opens as -1 , there will error.

i have no idea how to work this out !

Thank you anyways.

[Mario Malic]

What might be happening is that data is [1x1] and it only accepts one value. -1 is value that denotes end of file, so, probably it has read all the characters from the file with the last one being the -1.

[Suvvi Kuppur Narayana Swamy]

May be , that could be the case.

[Suvvi Kuppur Narayana Swamy]

But i dont understand why there is an error occuring at fread ??

[Mario Malic]

Upload the file.

[Suvvi Kuppur Narayana Swamy]

Sorry , i tried uploading but im not able to as this .bin format is not supported here.

[Mario Malic]

Your file might not be good, as I downloaded some random bin file from internet and used commands above and it worked. Search for similar topics.

[Suvvi Kuppur Narayana Swamy]

Okay ! Thank you so much for your help.