fopen is not being supported in my MATLAB version. What else can I use?

Whenever I use fopen it is giving some or the other error. Please tell me an aletrnative.

[Stephen23]

@Anuradha Bhattacharya: please show us the exact error message. This means all of the red text.

fopen is a very basic MATLAB function. There is no alternative, because it should work!

[Adam]

If you are getting an error with fopen you need to work out why rather than look for an alternative. It is a fairly fundamental function if you are dealing with files so there must be a good reason for it if it isn't working.

[Anuradha Bhattacharya]

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

[Stephen23]

The problem is not fopen, but that the file does not exist, is not in the location that you are specifying, or that you do not have permission to open it, or something similar.

You should always check the second output, and tell us exactly what it says:

 [fid,msg] = fopen(...)

Please tell us what msg is.

[KSSV]

I strongly suggest you to read the documentation properly before using any function.

[Walter Roberson]

if you are trying to use fopen() to write a file and you did not specify the path to the file, then you are probably not in a directory that you have permission to write in. The default directory when you start up MATLAB can end up being the one that MATLAB is installed in.

Answer 1

[James Tursa]

Do you have the fopen function shadowed by another function or variable? What does this show:

which -all fopen

[Alexander]

I am having the same issue in 2023a. "which fopen" prompts

"Warning: Function fopen has the same name as a MATLAB built-in. We suggest you rename the function to avoid a potential name conflict."

[John D'Errico]

@Alexander

That means you wrote some function named fopen. Find the function you wrote using this command:

which fopen -all

built-in (/MATLAB/toolbox/matlab/iofun/fopen)
/MATLAB/toolbox/matlab/serial/@serial/fopen.m           % serial method
/MATLAB/toolbox/instrument/instrument/@i2c/fopen.m      % i2c method
/MATLAB/toolbox/shared/instrument/@icinterface/fopen.m  % icinterface method

and rename the function you wrote to something else.

[Alexander]

Yep I just figured it out, thanks