code: public static int cusolverSpScsreigsHost(
          cusolverSpHandle handle, 
          int m, 
          int nnz, 
          cusparseMatDescr descrA, 
          Pointer csrValA, 
          Pointer csrRowPtrA, 
          Pointer csrColIndA, 
          cuComplex left_bottom_corner, 
          cuComplex right_upper_corner, 
          Pointer num_eigs)
      {
          return checkResult(cusolverSpScsreigsHostNative(handle, m, nnz, descrA, csrValA, csrRowPtrA, csrColIndA, left_bottom_corner, right_upper_corner, num_eigs));
      }
docs: ----------- enclosed eigenvalues