status=fclose(fid)status=fclose('all')
fclose(fid) closes the specified file, if it is open, and returns 0 if successful and -1 if unsuccessful. fid is a file identifier associated with an open file. (See fopen for a complete description of fid.)
fclose('all') closes all open files, (except standard input, output, and error) and returns 0 if successful and -1 if unsuccessful.
ferror,fopen,fprintf,fread,fscanf,fseek,ftell,fwrite,sprintf,sscan
(c) Copyright 1994 by The MathWorks, Inc.