armadillo and mex

[Carnez]

I am having difficulty compiling an example mex and armadillo program and was wondering if anyone could assist me. I am using Mac OS and have had successes with the installation.

#include "mex.h"
#include "math.h"
#include<armadillo>


using namespace arma;

void matlab2arma(mat& A, const mxArray *mxdata){
// delete [] A.mem; // don't do this!
access::rw(A.mem)=mxGetPr(mxdata);
access::rw(A.n_rows)=mxGetM(mxdata); // transposed!
access::rw(A.n_cols)=mxGetN(mxdata);
access::rw(A.n_elem)=A.n_rows*A.n_cols;
};

void freeVar(mat& A, const double *ptr){
access::rw(A.mem)=ptr;
access::rw(A.n_rows)=1; // transposed!
access::rw(A.n_cols)=1;
access::rw(A.n_elem)=1;
};

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
if (nrhs != 2)
mexErrMsgTxt("Incorrect number of input arguments");
if (nlhs != 1)
mexErrMsgTxt("Incorrect number of output arguments");

mat D1(1,1);
const double* D1mem=access::rw(D1.mem);
matlab2arma(D1,prhs[0]); // First create the matrix, then change it to point to the matlab data.

mat D2(1,1);
const double* D2mem=access::rw(D2.mem);
matlab2arma(D2,prhs[1]);

// check if the input corresponds to what you are expecting
if( D1.n_rows != D2.n_rows )
mexErrMsgTxt("Columns of D1 and D2 must be of equal length!");

if( D1.n_cols != D2.n_cols )
mexErrMsgTxt("Rows of D1 and D2 must be of equal length!");

plhs[0] = mxCreateDoubleMatrix(D1.n_rows, D1.n_cols, mxREAL);
mat output(1,1);
const double* outputmem=access::rw(output.mem);
matlab2arma(output,plhs[0]);

output=D1+D2;
// output.print();

freeVar(D1,D1mem); // Change back the pointers!!
freeVar(D2,D2mem);
freeVar(output,outputmem);
return;
}

The errors I am receiving are:
>> mex -I/Library/armadillo-3.4.4/include/ -lcblas -llapack example1.cpp
example1.cpp: In function 'void matlab2arma(arma::mat&, const mxArray*)':
example1.cpp:10: error: assignment of read-only data-member 'arma::Mat<double>::mem'
example1.cpp:11: error: 'access' has not been declared
example1.cpp:11: error: 'rw' was not declared in this scope
example1.cpp:12: error: 'access' has not been declared
example1.cpp:13: error: 'access' has not been declared
example1.cpp: In function 'void freeVar(arma::mat&, const double*)':
example1.cpp:17: error: 'access' has not been declared
example1.cpp:17: error: 'rw' was not declared in this scope
example1.cpp:18: error: 'access' has not been declared
example1.cpp:19: error: 'access' has not been declared
example1.cpp:20: error: 'access' has not been declared
example1.cpp: In function 'void mexFunction(int, mxArray**, int, const mxArray**)':
example1.cpp:31: error: 'access' has not been declared
example1.cpp:31: error: 'rw' was not declared in this scope
example1.cpp:35: error: 'access' has not been declared
example1.cpp:47: error: 'struct arma::mat' has no member named 'mems'


Thanks in Advanced