>> whos
Name Size Bytes Class Attributes
A 1x1 8 double
ans 1x1 8 double
>> exist('B','var')
ans =
0
>> exist('A','var')
ans =
1
>> help exist
exist Check if variables or functions are defined.
exist('A') returns: 0 if A does not exist
1 if A is a variable in the workspace
2 if A is an M-file on MATLAB's search path. It also returns 2 when
A is the full pathname to a file or when A is the name of an
ordinary file on MATLAB's search path
3 if A is a MEX-file on MATLAB's search path
4 if A is a Simulink model or library file on MATLAB's search path
5 if A is a built-in MATLAB function
6 if A is a P-file on MATLAB's search path
7 if A is a directory
8 if A is a class (exist returns 0 for Java classes if you
start MATLAB with the -nojvm option.)
exist('A') or exist('A.EXT') returns 2 if a file named 'A' or 'A.EXT' and the extension isn't a P or MEX function extension.
exist('A','var') checks only for variables. exist('A','builtin') checks only for built-in functions. exist('A','file') checks for files or directories. exist('A','dir') checks only for directories. exist('A','class') checks only for classes.
If A specifies a filename, MATLAB attempts to locate the file,
examines the filename extension, and determines the value to
return based on the extension alone. MATLAB does not examine
the contents or internal structure of the file.
When searching for a directory, MATLAB finds directories that are part
of MATLAB's search path. They can be specified by a partial path. It
also finds the current working directory specified by a partial path,
and subdirectories of the current working directory specified by
a relative path.
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