lin_algebra/svd.cpp

/*******************************************************
 * Copyright (c) 2014, ArrayFire
 * All rights reserved.
 *
 * This file is distributed under 3-clause BSD license.
 * The complete license agreement can be obtained at:
 * http://arrayfire.com/licenses/BSD-3-Clause
 ********************************************************/
 
#include <arrayfire.h>
#include <cstdio>
#include <cstdlib>
 
using namespace af;
 
int main(int argc, char* argv[]) {
    try {
        // Select a device and display arrayfire info
        int device = argc > 1 ? atoi(argv[1]) : 0;
        af::setDevice(device);
        af::info();
 
        float h_buffer[] = {1, 4, 2, 5, 3, 6};  // host array
        array in(2, 3, h_buffer);               // copy host data to device
 
        array u;
        array s_vec;
        array vt;
        svd(u, s_vec, vt, in);
 
        array s_mat    = diag(s_vec, 0, false);
        array in_recon = matmul(u, s_mat, vt(seq(2), span));
 
        af_print(in);
        af_print(s_vec);
        af_print(u);
        af_print(s_mat);
        af_print(vt);
        af_print(in_recon);
 
    } catch (af::exception& e) {
        fprintf(stderr, "%s\n", e.what());
        throw;
    }
 
    return 0;
}