/usr/share/vtk/Array/Cxx/IdentityMatrix.cxx is in vtk-examples 5.8.0-17.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <vtkArrayPrint.h>
#include <vtkSparseArray.h>
#include <vtksys/ios/sstream>
int main(int argc, char* argv[])
{
if(argc != 2)
{
cerr << "usage: " << argv[0] << " matrix-size\n";
return 1;
}
int size = 0;
vtksys_ios::istringstream buffer(argv[1]);
buffer >> size;
if(size < 1)
{
cerr << "matrix size must be an integer greater-than zero\n";
return 2;
}
// Create a sparse identity matrix:
vtkSparseArray<double>* matrix = vtkSparseArray<double>::New();
matrix->Resize(0, 0); // To set the number of dimensions
for(int n = 0; n != size; ++n)
{
matrix->AddValue(vtkArrayCoordinates(n, n), 1);
}
matrix->SetExtentsFromContents(); // To synchronize the array extents with newly-added values.
cout << "matrix:\n";
vtkPrintMatrixFormat(cout, matrix);
cout << "\n";
matrix->Delete();
return 0;
}
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