void C_LinStatExpCov(const double *x, const int p,

                     const double *y, const int q,

                     const double *weights, const int n,

                     const int cexpcovinf, SEXP expcovinf, SEXP ans);

void C_LinStatExpCovMPinv(SEXP linexpcov, double tol);

void C_MLinearStatistic(SEXP linexpcov, SEXP ScoreMatrix, SEXP ans);

double C_TestStatistic(const SEXP linexpcov, const int type, const double tol);

double C_ConditionalPvalue(const double tstat, SEXP linexpcov,

                           const int type, double tol,

                           int *maxpts, double *releps, double *abseps);