matlab编译.mexw32/.mexw64文件

已有文件example.m、example.cpp、example.mexw32、example.mexw64，在matlab进行调用之前，有必要使用mex对文件进行一次编译，如下：

if exist('example')~=3
    mexexample.cpp COMPFLAGS="/openmp $COMPFLAGS" CXXFLAGS="\$CFLAGS -fopenmp" LDFLAGS="\$LDFLAGS -fopenmp" -largeArrayDims 
end;

附：

>> 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 MDL-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 Java class