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MatDrawRandomRows.h

Go to the documentation of this file.

#ifndef Impala_Core_Matrix_MatDrawRandomRows_h
#define Impala_Core_Matrix_MatDrawRandomRows_h

#include "Core/Matrix/MatFunc.h"
#include "Core/Matrix/Mat.h"
#include "Core/Matrix/MatKeepSpecificRows.h"
#include "Util/RandomGenerator.h"

namespace Impala
{
namespace Core
{
namespace Matrix
{


Mat*
MatDrawRandomRows(Mat* data, int requestedSize)
{
    // data contains (n,d) d-D features
    int n = MatNrRow(data);
    int d = MatNrCol(data);
    std::vector<int> indices;
    for(int j = 0; j < n; j++)
    {
        indices.push_back(j);
    }
    Util::RandomGenerator::GetInstance().PermutateVector(indices);

    std::vector<int> keepers;
    for(int j = 0; j < requestedSize; j++)
    {
        keepers.push_back(indices[j]);
    }
    std::sort(keepers.begin(), keepers.end());

    // we have the indices; now copy vectors
    return MatKeepSpecificRows(data, keepers);
}


} // namespace Matrix
} // namespace Core
} // namespace Impala

#endif

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