fileID = fopen(filename,permission)opens the file with the type of access specified by permission.

f'ilename: Name of the file to open, including the file extension, specified as a string. If the file is not in the current folder， file name must include a full or a relative path.

If you open a file with read access and the file is not in the current folder, then fopen searches along the MATLAB search path.

If you open a file with write or append access and the file is not in the current folder, then fopen creates a file in the current directory.

出錯：數(shù)據(jù)不在同一folder內(nèi)。

'wb':文件系統(tǒng)會按純粹的二進(jìn)制格式進(jìn)行操作，因此也就不存在格式轉(zhuǎn)換的問題了。

返回值：If fopen cannot open the file, then fileID is -1.

fileID = ?returns an integer file identifier equal to or greater than 3. MATLAB?reserves file identifiers0,1, and2for standard input, standard output (the screen), and standard error, respectively.