How do I typecast an mwArray to a C++ scalar variable?

How do I typecast an mwArray to a C++ scalar variable?

The methods for Extracting Data from an mwArray on page 3-41 of the MATLAB C++ Math Library User's Guide does not seem to work. I added the following code fragment to ex2.cpp at line 24:

mwArray U, S, V;

int32 i;

U=4;

i=U;

and I got the following error messages:

 C:\programs\matlabR12\extern\include\cpp\stdexcpt.h(24) : warning C4273: 'strdup' : inconsistent dll

 linkage.  dllexport assumed.

 ex2_2.cpp(30) : error C2679: binary '=' : no operator defined which takes a right-hand operand of type

 'class mwArray' (or there is no acceptable conversion)

 MBUILD.BAT: Error: Compile of 'ex2_2.cpp' failed.

Answer 1

[MathWorks Support Team]

There is an error in the MATLAB C++ Math Library User's Guide 2.1 regarding implicit and explicit typecasting. The following codes illustrate how to correctly cast an mwArray to a C++ scalar variable:

int32 i;

double j;

mwArray A = 5;

mwArray B = 25.97;

i = A.Int();

j = B.Double();

This error in the MATLAB C++ Math Library User's Guide will be corrected for the next release of the guide.