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AbstractLinAlgPack_SparseCOOReadMatrix.cpp
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1 #if 0
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43 
44 #include <stdlib.h>
45 
47 
48 // Throw an exception if the char is not ':'
49 namespace {
50 inline void assert_sep_char(char c) {
51  if(c != ':')
52  throw AbstractLinAlgPack::InputException("Sparse COO matrix input stream error: The seperator between the element, row indice and column indice must be a \':\'");
53 }
54 inline void assert_eof(std::istream& istrm) {
55  if(istrm.eof())
56  throw AbstractLinAlgPack::InputException("Sparse COO matrix input stream error: Premature end to the input file.");
57 }
58 }
59 
61  , std::valarray<value_type>& a, std::valarray<indice_type>& ivect
62  , std::valarray<indice_type>& jvect)
63 {
64  // read in dimensions and resize
65  istrm >> m; assert_eof(istrm);
66  istrm >> n; assert_eof(istrm);
67  istrm >> nz;
68  a.resize(nz);
69  ivect.resize(nz);
70  jvect.resize(nz);
71 
72  // Read in the non-zero elements
73  value_type *p_a = &a[0],
74  *p_a_last = p_a + nz;
75  indice_type *p_ivect = &ivect[0],
76  *p_jvect = &jvect[0];
77 
78  for(; p_a != p_a_last; ++p_a, ++p_ivect, ++p_jvect) {
79  const int bs = 50;
80  char num[bs];
81  char c;
82  assert_eof(istrm);
83  istrm.get(num, bs-1, ':'); assert_eof(istrm); *p_a = ::atof(num); // Read in ak
84  istrm.get(c); assert_eof(istrm); assert_sep_char(c); // Read in ':'
85  istrm.get(num, bs-1, ':'); assert_eof(istrm); *p_ivect = ::atoi(num);// Read in ik
86  istrm.get(c); assert_eof(istrm); assert_sep_char(c); // Read in ':'
87  istrm >> *p_jvect; // Read in jk
88  }
89 }
90 
91 #endif // 0
AbstractLinAlgPack::size_type size_type
Base class for input exceptions (Preconditions).
void read_coo_into_valarrays(std::istream &istrm, size_type &m, size_type &n, size_type &nz, std::valarray< value_type > &a, std::valarray< indice_type > &ivect, std::valarray< indice_type > &jvect)
Read in a Coordinate Matrix from a C++ input stream and store it in valarrays.
const f_int f_dbl_prec const f_int const f_int const f_int jvect[]
const f_int f_dbl_prec const f_int const f_int ivect[]
AbstractLinAlgPack::value_type value_type