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EpetraExt_MultiVectorIn.cpp
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4// EpetraExt: Epetra Extended - Linear Algebra Services Package
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42#include "Epetra_Comm.h"
43#include "Epetra_MultiVector.h"
44#include "Epetra_Vector.h"
45#include "Epetra_BlockMap.h"
46
47using namespace EpetraExt;
48namespace EpetraExt {
49
50int MatrixMarketFileToMultiVector( const char *filename, const Epetra_BlockMap & map, Epetra_MultiVector * & A) {
51
52 const int lineLength = 1025;
53 const int tokenLength = 35;
54 char line[lineLength];
55 char token1[tokenLength];
56 char token2[tokenLength];
57 char token3[tokenLength];
58 char token4[tokenLength];
59 char token5[tokenLength];
60 int M, N;
61
62 FILE * handle = 0;
63
64 handle = fopen(filename,"r"); // Open file
65 if (handle == 0)
66 EPETRA_CHK_ERR(-1); // file not found
67
68 // Check first line, which should be "%%MatrixMarket matrix coordinate real general" (without quotes)
69 if(fgets(line, lineLength, handle)==0) return(-1);
70 if(sscanf(line, "%s %s %s %s %s", token1, token2, token3, token4, token5 )==0) return(-1);
71 if (strcmp(token1, "%%MatrixMarket") ||
72 strcmp(token2, "matrix") ||
73 strcmp(token3, "array") ||
74 strcmp(token4, "real") ||
75 strcmp(token5, "general")) return(-1);
76
77 // Next, strip off header lines (which start with "%")
78 do {
79 if(fgets(line, lineLength, handle)==0) return(-1);
80 } while (line[0] == '%');
81
82 // Next get problem dimensions: M, N
83 if(sscanf(line, "%d %d", &M, &N)==0) return(-1);
84
85 // Compute the offset for each processor for when it should start storing values
86 int numMyPoints = map.NumMyPoints();
87 int offset;
88 map.Comm().ScanSum(&numMyPoints, &offset, 1); // ScanSum will compute offsets for us
89 offset -= numMyPoints; // readjust for my PE
90
91 // Now construct vector/multivector
92 if (N==1)
93 A = new Epetra_Vector(map);
94 else
95 A = new Epetra_MultiVector(map, N);
96
97 double ** Ap = A->Pointers();
98
99 for (int j=0; j<N; j++) {
100 double * v = Ap[j];
101
102 // Now read in lines that we will discard
103 for (int i=0; i<offset; i++)
104 if(fgets(line, lineLength, handle)==0) return(-1);
105
106 // Now read in each value and store to the local portion of the the if the row is owned.
107 double V;
108 for (int i=0; i<numMyPoints; i++) {
109 if(fgets(line, lineLength, handle)==0) return(-1);
110 if(sscanf(line, "%lg\n", &V)==0) return(-1);
111 v[i] = V;
112 }
113 // Now read in the rest of the lines to discard
114 for (int i=0; i < M-numMyPoints-offset; i++) {
115 if(fgets(line, lineLength, handle)==0) return(-1);
116 }
117 }
118
119 if (fclose(handle)) return(-1);
120
121 return(0);
122}
123
124} // namespace EpetraExt
#define EPETRA_CHK_ERR(a)
double ** Pointers() const
EpetraExt::BlockCrsMatrix: A class for constructing a distributed block matrix.
int MatrixMarketFileToMultiVector(const char *filename, const Epetra_BlockMap &map, Epetra_MultiVector *&A)
Constructs an Epetra_MultiVector object from a Matrix Market format file.
const int N