fid = fopen(filename,'r')

As an AI language model, I do not have access to the local file system. However, I can explain the syntax of the given code.

The code `fid = fopen(filename,'r')` is used to open a file in read-only mode. `filename` is a string that specifies the name of the file to be opened. `fid` is a file identifier that is returned by the `fopen` function. This identifier is used in subsequent file operations to refer to the opened file.

If the file could not be opened, `fopen` returns -1. Otherwise, it returns a positive integer value, which is the file identifier.

Example:

Suppose we have a file named `test.txt` in the current working directory. We can open the file in read-only mode using the following code:

fid = fopen('test.txt', 'r');

This code will return a file identifier `fid`, which can be used to perform file operations such as reading data from the file.