How do I read an input array of type double in mex?

I am creating an Array of type double using arr = rand(5,1) I simply want to be able to pass into into my mex function and read the values

void mexFunction(int nlhs, mxArray *plhs[],
         int nrhs, const mxArray *prhs[])
{

      double *A;
      const mwSize *dims;
      //dims = mxGetDimensions(prhs[0]);
      //M = (int)dims[0]; N = (int)dims[1];      
      A = mxGetData(prhs[0]);
      mexPrintf("%d\n", A[0]);

Answer 1

[James Tursa]

You almost had it correctly. But the %d format is for integer types only, not floating point. So use one of the floating point formats, e.g. %f or %e or %g.

mexPrintf("%f\n", A[0]);