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Question

### Code¶

/* The output is:

10 20 30
40 50 60
70 80 90

+-----------------+------------------+
|                 | value            |
+-----------------+------------------+
| 2               | 30               |
| 1               | 20               |
| 0               | 10               |
| 2               | 60               |
| 1               | 50               |
| 0               | 40               |
| 2               | 90               |
| 1               | 80               |
| 0               | 70               |
+-----------------+------------------+

The first column is the column index of the item in the 'value' column.
The row index is given by the number of times we've previously seen the column
index. For some reason, zeros in the matrix are not reported in the table.

For example, the first row says that the value '30' is in column 2 of the matrix
(0-based indexing). Since we have not previously seen an item in column 2, it is
in row 0 of the matrix.

The fourth row says that the value '60' is also in column 2. We infer that '60'
is row 1 of the matrix because we have already seen one item (the '30') in
column 2.
*/

#include <vtkArrayData.h>
#include <vtkArrayPrint.h>
#include <vtkDenseArray.h>
#include <vtkNew.h>
#include <vtkTable.h>

int main(int, char*[])
{
vtkNew<vtkDenseArray<double>> array;

array->Resize(3, 3);

unsigned int counter{1};
unsigned int scale{10};
for (vtkIdType i = 0; i < array->GetExtents()[0].GetEnd(); i++)
{
for (vtkIdType j = 0; j < array->GetExtents()[1].GetEnd(); j++)
{
array->SetValue(i, j, counter * scale);
counter++;
}
}

vtkPrintMatrixFormat(std::cout, array.GetPointer());

vtkNew<vtkArrayData> arrayData;

return EXIT_SUCCESS;
}


### CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

find_package(VTK COMPONENTS
CommonCore
CommonDataModel
InfovisCore
)

if (NOT VTK_FOUND)
message(FATAL_ERROR "AdjacencyMatrixToEdgeTable: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
target_link_libraries(AdjacencyMatrixToEdgeTable PRIVATE ${VTK_LIBRARIES} ) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS AdjacencyMatrixToEdgeTable MODULES${VTK_LIBRARIES}
)


cd AdjacencyMatrixToEdgeTable/build


If VTK is installed:

cmake ..


If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..


Build the project:

make


and run it:

./AdjacencyMatrixToEdgeTable


WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.