C++ API Reference for Intel® Data Analytics Acceleration Library 2018 Update 2

datastructures_packedsymmetric.cpp

/* file: datastructures_packedsymmetric.cpp */
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/*
! Content:
! C++ example of using packed data structures
!******************************************************************************/
#include "daal.h"
#include "service.h"
using namespace daal;
typedef PackedSymmetricMatrix<NumericTableIface::lowerPackedSymmetricMatrix> LowerPackedSymmetricMatrix;
typedef services::SharedPtr<LowerPackedSymmetricMatrix> LowerPackedSymmetricMatrixPtr;
int main()
{
std::cout << "Packed symmetric matrix example" << std::endl << std::endl;
const size_t nDim = 5;
const size_t firstReadRow = 0;
const size_t nRead = 5;
size_t readFeatureIdx;
/*Example of using a packed symmetric matrix */
float data[nDim * (nDim + 1) / 2] =
{
0.0f, 0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f, 0.8f, 0.9f, 1.0f, 1.1f, 1.2f, 1.3f, 1.4f
};
LowerPackedSymmetricMatrixPtr dataTable = LowerPackedSymmetricMatrix::create(data, nDim);
checkPtr(dataTable.get());
BlockDescriptor<> block;
/* Read a block of rows */
dataTable->getBlockOfRows(firstReadRow, nRead, readOnly, block);
std::cout << block.getNumberOfRows() << " rows are read" << std::endl;
printArray<float>(block.getBlockPtr(), nDim, block.getNumberOfRows(), "Print 3 rows from packed symmetric matrix as float:");
/* Read a feature(column) and write into it */
readFeatureIdx = 2;
dataTable->getBlockOfColumnValues(readFeatureIdx, firstReadRow, nDim, readWrite, block);
printArray<float>(block.getBlockPtr(), 1, block.getNumberOfRows(), "Print the third feature of packed symmetric matrix:");
/* Set new value to a buffer and release it */
float* dataBlock = block.getBlockPtr();
dataBlock[readFeatureIdx - 1] = -1;
dataBlock[readFeatureIdx + 1] = -2;
dataTable->releaseBlockOfColumnValues(block);
/* Read a block of rows. Ensure that data has changed */
dataTable->getBlockOfRows(firstReadRow, nRead, readOnly, block);
std::cout << block.getNumberOfRows() << " rows are read" << std::endl;
printArray<float>(block.getBlockPtr(), nDim, block.getNumberOfRows(), "Print 3 rows from packed symmetric matrix as float:");
return 0;
}

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