RangeFill.h

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/*
 * Copyright (c) The Shogun Machine Learning Toolbox
 * Written (w) 2016 Kunal Arora
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
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 *
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#ifndef RANGE_FILL_IMPL_H_
#define RANGE_FILL_IMPL_H_

#include <shogun/lib/config.h>
#include <shogun/lib/SGVector.h>
#include <shogun/lib/SGMatrix.h>

#include <numeric>

namespace shogun
{

namespace linalg
{

namespace implementation
{

template <enum Backend, class Matrix>
struct range_fill
{
    typedef typename Matrix::Scalar T;

    static void compute(Matrix A, T start);

};

template <class Matrix>
struct range_fill<Backend::EIGEN3, Matrix>
{
    typedef typename Matrix::Scalar T;

    typedef Eigen::Matrix<T,Eigen::Dynamic,1> VectorXt;

    static void compute(SGVector<T> A, T start)
    {
        compute(A, A.size(), start);
    }

    static void compute(SGVector<T> A, index_t len, T start)
    {
        Eigen::Map<VectorXt> A_eig=A;
        A_eig.setLinSpaced(len, start, A.size()+start-1);
    }

};

}

}

}
#endif //RANGE_FILL_IMPL_H_