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example/verySimple/cxx_main.cpp
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4// Epetra: Linear Algebra Services Package
5// Copyright 2011 Sandia Corporation
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41
42
43#include "Epetra_SerialComm.h"
44#include "Epetra_Map.h"
45#include "Epetra_Vector.h"
46#include "Epetra_Version.h"
47
48int main(int argc, char *argv[])
49{
50
51 std::cout << Epetra_Version() << std::endl << std::endl;
52
54
55 int NumElements = 1000;
56
57 // Construct a Map with NumElements and index base of 0
58 Epetra_Map Map(NumElements, 0, Comm);
59
60 // Create x and b vectors
61 Epetra_Vector x(Map);
62 Epetra_Vector b(Map);
63
64 b.Random();
65 x.Update(2.0, b, 0.0); // x = 2*b
66
67 double bnorm, xnorm;
68 x.Norm2(&xnorm);
69 b.Norm2(&bnorm);
70
71 std::cout << "2 norm of x = " << xnorm << std::endl
72 << "2 norm of b = " << bnorm << std::endl;
73
74 return 0;
75}
76
std::string Epetra_Version()
Epetra_Map: A class for partitioning vectors and matrices.
Definition Epetra_Map.h:119
int Update(double ScalarA, const Epetra_MultiVector &A, double ScalarThis)
Update multi-vector values with scaled values of A, this = ScalarThis*this + ScalarA*A.
int Random()
Set multi-vector values to random numbers.
int Norm2(double *Result) const
Compute 2-norm of each vector in multi-vector.
Epetra_SerialComm: The Epetra Serial Communication Class.
Epetra_Vector: A class for constructing and using dense vectors on a parallel computer.
int main(int argc, char *argv[])