No Symbols Loaded: libmex.pdb not loaded (throw_segv_longjmp_seh_filter() = EXCEPTION_CONTINUE_SEARCH : C++ exception) - matlab

Question

In order to create a MEX function and use it in my MATLAB code, like this:
[pow,index] = mx_minimum_power(A11,A12,A13,A22,A23,A33);
I've created the file mx_minimum_power.cpp and written the following code in it:
#include <math.h>
#include <complex>
#include "mex.h"
#include "matrix.h"
#include "cvm.h"
#include "blas.h"
#include "cfun.h"
using std::complex;
using namespace cvm;
/* The gateway function */
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
const int arraysize = 62172;
const int matrixDimention = 3;
float *inMatrixA11 = (float *)mxGetPr(prhs[0]);
complex<float> *inMatrixA12 = (complex<float> *)mxGetPr(prhs[1]);
complex<float> *inMatrixA13 = (complex<float> *)mxGetPr(prhs[2]);
float *inMatrixA22 = (float *)mxGetPr(prhs[3]);
complex<float> *inMatrixA23 = (complex<float> *)mxGetPr(prhs[4]);
float *inMatrixA33 = (float *)mxGetPr(prhs[5]);
basic_schmatrix< float, complex<float> > A(matrixDimention);
int i = 0;
for (i = 0; i < arraysize; i++)
{
A.set(1, 1, inMatrixA11[i]);
A.set(1, 2, inMatrixA12[i]);
A.set(1, 3, inMatrixA13[i]);
A.set(2, 2, inMatrixA22[i]);
A.set(2, 3, inMatrixA23[i]);
A.set(3, 3, inMatrixA33[i]);
}
}
And then in order to be able to debug the code, I've created the mx_minimum_power.pdb and mx_minimum_power.mexw64 files, using the following code in the Matlab Command Window:
mex -g mx_minimum_power.cpp cvm_em64t_debug.lib
The files blas.h, cfun.h, cvm.h and cvm_em64t_debug.lib are in the same directory as mx_minimum_power.cpp.
They are the headers and library files of the CVM Class Library.
Then I've attached MATLAB.exe to Visual Studio 2013, using the way explained here.
and have set a breakpoint at line40:
When I run my MATLAB code, there's no error until the specified line.
But if I click on the Step Over button, I'll encounter the following message:
With the following information added to the Output:
First-chance exception at 0x000007FEFCAE9E5D in MATLAB.exe: Microsoft C++ exception: cvm::cvmexception at memory location 0x0000000004022570.
> throw_segv_longjmp_seh_filter()
throw_segv_longjmp_seh_filter(): C++ exception
< throw_segv_longjmp_seh_filter() = EXCEPTION_CONTINUE_SEARCH
Can you suggest me why libmex.pdb is needed at that line and how should I solve the issue?
If I stop debugging, I'll get the following information in MATLAB Command Window:
Unexpected Standard exception from MEX file.
What() is:First index value 0 is out of [1,4) range
Right before pressing the step over button, we have the following values for A11[0],A12[0],A13[0],A22[0],A23[0],A33[0]:
that are just right as my expectations, according to what MATLAB passes to the MEX function:
Maybe the problem is because of wrong allocation for matrix A, it is as follows just before pressing the step over button.

Answer 1

The problem occurs because we have the following code in lines 48 to 53 of the cvm.h file:
// 5.7 0-based indexing
#if defined (CVM_ZERO_BASED)
# define CVM0 TINT_ZERO //!< Index base, 1 by default or 0 when \c CVM_ZERO_BASED is defined
#else
# define CVM0 TINT_ONE //!< Index base, 1 by default or 0 when \c CVM_ZERO_BASED is defined
#endif
That makes CVM0 = 1 by default. So if we press the Step Into(F11) button at the specified line two times, we will get into line 34883 of the file cvm.h:
basic_schmatrix& set(tint nRow, tint nCol, TC c) throw(cvmexception)
{
this->_set_at(nRow - CVM0, nCol - CVM0, c);
return *this;
}
Press Step Into(F11) at line this->_set_at(nRow - CVM0, nCol - CVM0, c); and you'll go to the definition of the function _set_at:
// sets both elements to keep matrix hermitian, checks ranges
// zero based
void _set_at(tint nRow, tint nCol, TC val) throw(cvmexception)
{
_check_lt_ge(CVM_OUTOFRANGE_LTGE1, nRow, CVM0, this->msize() + CVM0);
_check_lt_ge(CVM_OUTOFRANGE_LTGE2, nCol, CVM0, this->nsize() + CVM0);
if (nRow == nCol && _abs(val.imag()) > basic_cvmMachMin<TR>()) { // only reals on main diagonal
throw cvmexception(CVM_BREAKS_HERMITIANITY, "real number");
}
this->get()[this->ld() * nCol + nRow] = val;
if (nRow != nCol) {
this->get()[this->ld() * nRow + nCol] = _conjugate(val);
}
}
pressing Step Over(F10) button,you'll get the result:
so in order to get nRow=1 and nCol=1 and not nRow=0 and nCol=0, which is out of the range [1,4), you should write that line of code as:
A.set(2, 2, inMatrixA11[i]);