UMFPACK and CSPARSE

To use UMFPack in Ubuntu, it is included in suitesparse package.
1. To install the package in Ubuntu 
   >>sudo apt-get install libsuitesparse-dev
2. Add library flag -lumfpack
3. Include header file
   #include
4. Solve Ax=b in csparse format as following  

void IPSparse::setDir(FP_TYPE* dir,cs_ColSparse* coeffMat,FP_TYPE* rhs){
  void *Symbolic, *Numeric;
  (void) umfpack_di_symbolic(coeffMat->n, coeffMat->n, coeffMat->p, coeffMat->i, coeffMat->x, &Symbolic, NULL,NULL);
  (void) umfpack_di_numeric(coeffMat->p, coeffMat->i, coeffMat->x, Symbolic, &Numeric, NULL, NULL);
  umfpack_di_free_symbolic(&Symbolic);
  (void) umfpack_di_solve(UMFPACK_A, coeffMat->p, coeffMat->i, coeffMat->x, dir, rhs, Numeric, NULL, NULL);
  umfpack_di_free_numeric(&Numeric);

}