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<div class="title">vector-range.cpp</div> </div>
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<p>This tutorial explains the use of vector ranges with simple BLAS level 1 and 2 operations. Vector slices are used similarly and not further considered in this tutorial.</p>
<p>We start with including the required headers: </p>
<div class="fragment"><div class="line"><span class="comment">// Activate ublas support in ViennaCL</span></div>
<div class="line"><span class="preprocessor">#define VIENNACL_WITH_UBLAS</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// System headers</span></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <string></span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ViennaCL headers</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="scalar_8hpp.html">viennacl/scalar.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="matrix_8hpp.html">viennacl/matrix.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="prod_8hpp.html">viennacl/linalg/prod.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="vector__proxy_8hpp.html">viennacl/vector_proxy.hpp</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// Boost headers</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/vector.hpp"</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/vector_proxy.hpp"</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/io.hpp"</span></div>
</div><!-- fragment --><p> In the <a class="el" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main()</a> routine a couple of vectors from both Boost.uBLAS and ViennaCL are set up. Then, subvectors are extracted and manipulated using the usual operator overloads. </p>
<div class="fragment"><div class="line"><span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> (<span class="keywordtype">int</span>, <span class="keyword">const</span> <span class="keywordtype">char</span> **)</div>
<div class="line">{</div>
<div class="line"> <span class="comment">//feel free to change the floating point type to 'double' if supported by your hardware</span></div>
<div class="line"> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a name="a1"></a><a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keyword">typedef</span> boost::numeric::ublas::vector<ScalarType> VectorType;</div>
<div class="line"> <span class="keyword">typedef</span> <a name="_a2"></a><a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> VCLVectorType;</div>
<div class="line"></div>
<div class="line"> std::size_t dim_large = 7;</div>
<div class="line"> std::size_t dim_small = 3;</div>
</div><!-- fragment --><p> Setup ublas objects and fill with data: </p>
<div class="fragment"><div class="line">VectorType ublas_v1(dim_large);</div>
<div class="line">VectorType ublas_v2(dim_small);</div>
<div class="line"></div>
<div class="line"><span class="keywordflow">for</span> (std::size_t i=0; i<ublas_v1.size(); ++i)</div>
<div class="line"> ublas_v1(i) = <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>(i+1);</div>
<div class="line"></div>
<div class="line"><span class="keywordflow">for</span> (std::size_t i=0; i<ublas_v2.size(); ++i)</div>
<div class="line"> ublas_v2(i) = <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>(dim_large + i);</div>
</div><!-- fragment --><p> Extract submatrices using the ranges in ublas </p>
<div class="fragment"><div class="line"><a name="a3"></a><a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r1(0, dim_small); <span class="comment">//the first 'dim_small' entries</span></div>
<div class="line"><a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r2(dim_small - 1, 2*dim_small - 1); <span class="comment">// 'dim_small' entries somewhere from the middle</span></div>
<div class="line"><a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r3(dim_large - dim_small, dim_large); <span class="comment">// the last 'dim_small' entries</span></div>
<div class="line">boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub1(ublas_v1, ublas_r1); <span class="comment">// front part of vector v_1</span></div>
<div class="line">boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub2(ublas_v1, ublas_r2); <span class="comment">// center part of vector v_1</span></div>
<div class="line">boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub3(ublas_v1, ublas_r3); <span class="comment">// tail of vector v_1</span></div>
</div><!-- fragment --><p> Create ViennaCL objects and copy data over from uBLAS objects. </p>
<div class="fragment"><div class="line">VCLVectorType vcl_v1(dim_large);</div>
<div class="line">VCLVectorType vcl_v2(dim_small);</div>
<div class="line"></div>
<div class="line"><a name="a4"></a><a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v1, vcl_v1);</div>
<div class="line"><a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v2, vcl_v2);</div>
</div><!-- fragment --><p> Extract submatrices using the range-functionality in ViennaCL. This works exactly the same way as for uBLAS. </p>
<div class="fragment"><div class="line"><a name="_a5"></a><a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r1(0, dim_small); <span class="comment">//the first 'dim_small' entries</span></div>
<div class="line"><a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r2(dim_small - 1, 2*dim_small - 1); <span class="comment">// 'dim_small' entries somewhere from the middle</span></div>
<div class="line"><a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r3(dim_large - dim_small, dim_large); <span class="comment">// the last 'dim_small' entries</span></div>
<div class="line"><a name="_a6"></a><a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub1(vcl_v1, vcl_r1); <span class="comment">// front part of vector v_1</span></div>
<div class="line"><a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub2(vcl_v1, vcl_r2); <span class="comment">// center part of vector v_1</span></div>
<div class="line"><a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub3(vcl_v1, vcl_r3); <span class="comment">// tail of vector v_1</span></div>
</div><!-- fragment --><p> Copy from ublas to submatrices and back: </p>
<div class="fragment"><div class="line">ublas_v1_sub1 = ublas_v2;</div>
<div class="line"><a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v2, vcl_v1_sub1);</div>
<div class="line"><a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(vcl_v1_sub1, ublas_v2);</div>
</div><!-- fragment --><p> Addition of subvectors: </p>
<div class="fragment"><div class="line">ublas_v1_sub1 += ublas_v1_sub1;</div>
<div class="line">vcl_v1_sub1 += vcl_v1_sub1;</div>
<div class="line"></div>
<div class="line">ublas_v1_sub2 += ublas_v1_sub2;</div>
<div class="line">vcl_v1_sub2 += vcl_v1_sub2;</div>
<div class="line"></div>
<div class="line">ublas_v1_sub3 += ublas_v1_sub3;</div>
<div class="line">vcl_v1_sub3 += vcl_v1_sub3;</div>
</div><!-- fragment --><p> Print full vectors. Notice that the various entries have changed according to the subvector manipulations above. </p>
<div class="fragment"><div class="line">std::cout << <span class="stringliteral">"ublas: "</span> << ublas_v1 << std::endl;</div>
<div class="line">std::cout << <span class="stringliteral">"ViennaCL: "</span> << vcl_v1 << std::endl;</div>
</div><!-- fragment --><p> That's it. Print success message and exit. </p>
<div class="fragment"><div class="line"> std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
</div><!-- fragment --> <h2>Full Example Code</h2>
<div class="fragment"><div class="line"><span class="comment">/* =========================================================================</span></div>
<div class="line"><span class="comment"> Copyright (c) 2010-2016, Institute for Microelectronics,</span></div>
<div class="line"><span class="comment"> Institute for Analysis and Scientific Computing,</span></div>
<div class="line"><span class="comment"> TU Wien.</span></div>
<div class="line"><span class="comment"> Portions of this software are copyright by UChicago Argonne, LLC.</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> -----------------</span></div>
<div class="line"><span class="comment"> ViennaCL - The Vienna Computing Library</span></div>
<div class="line"><span class="comment"> -----------------</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> Project Head: Karl Rupp rupp@iue.tuwien.ac.at</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> (A list of authors and contributors can be found in the PDF manual)</span></div>
<div class="line"><span class="comment"></span></div>
<div class="line"><span class="comment"> License: MIT (X11), see file LICENSE in the base directory</span></div>
<div class="line"><span class="comment">============================================================================= */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// Activate ublas support in ViennaCL</span></div>
<div class="line"><span class="preprocessor">#define VIENNACL_WITH_UBLAS</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// System headers</span></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <string></span></div>
<div class="line"></div>
<div class="line"><span class="comment">// ViennaCL headers</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="scalar_8hpp.html">viennacl/scalar.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="matrix_8hpp.html">viennacl/matrix.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="prod_8hpp.html">viennacl/linalg/prod.hpp</a>"</span></div>
<div class="line"><span class="preprocessor">#include "<a class="code" href="vector__proxy_8hpp.html">viennacl/vector_proxy.hpp</a>"</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// Boost headers</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/vector.hpp"</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/vector_proxy.hpp"</span></div>
<div class="line"><span class="preprocessor">#include "boost/numeric/ublas/io.hpp"</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> <a class="code" href="tests_2src_2bisect_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> (<span class="keywordtype">int</span>, <span class="keyword">const</span> <span class="keywordtype">char</span> **)</div>
<div class="line">{</div>
<div class="line"> <span class="comment">//feel free to change the floating point type to 'double' if supported by your hardware</span></div>
<div class="line"> <span class="keyword">typedef</span> <span class="keywordtype">float</span> <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>;</div>
<div class="line"></div>
<div class="line"> <span class="keyword">typedef</span> boost::numeric::ublas::vector<ScalarType> VectorType;</div>
<div class="line"> <span class="keyword">typedef</span> <a class="code" href="classviennacl_1_1vector.html">viennacl::vector<ScalarType></a> VCLVectorType;</div>
<div class="line"></div>
<div class="line"> std::size_t dim_large = 7;</div>
<div class="line"> std::size_t dim_small = 3;</div>
<div class="line"></div>
<div class="line"> VectorType ublas_v1(dim_large);</div>
<div class="line"> VectorType ublas_v2(dim_small);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (std::size_t i=0; i<ublas_v1.size(); ++i)</div>
<div class="line"> ublas_v1(i) = <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>(i+1);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (std::size_t i=0; i<ublas_v2.size(); ++i)</div>
<div class="line"> ublas_v2(i) = <a class="code" href="fft__1d_8cpp.html#ad5c19ca4f47d3f8ec21232a5af2624e5">ScalarType</a>(dim_large + i);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> <a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r1(0, dim_small); <span class="comment">//the first 'dim_small' entries</span></div>
<div class="line"> <a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r2(dim_small - 1, 2*dim_small - 1); <span class="comment">// 'dim_small' entries somewhere from the middle</span></div>
<div class="line"> <a class="code" href="namespaceviennacl.html#ae92c62d9fd59870c1f6b881e391d32aa">boost::numeric::ublas::range</a> ublas_r3(dim_large - dim_small, dim_large); <span class="comment">// the last 'dim_small' entries</span></div>
<div class="line"> boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub1(ublas_v1, ublas_r1); <span class="comment">// front part of vector v_1</span></div>
<div class="line"> boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub2(ublas_v1, ublas_r2); <span class="comment">// center part of vector v_1</span></div>
<div class="line"> boost::numeric::ublas::vector_range<VectorType> ublas_v1_sub3(ublas_v1, ublas_r3); <span class="comment">// tail of vector v_1</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> VCLVectorType vcl_v1(dim_large);</div>
<div class="line"> VCLVectorType vcl_v2(dim_small);</div>
<div class="line"></div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v1, vcl_v1);</div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v2, vcl_v2);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> <a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r1(0, dim_small); <span class="comment">//the first 'dim_small' entries</span></div>
<div class="line"> <a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r2(dim_small - 1, 2*dim_small - 1); <span class="comment">// 'dim_small' entries somewhere from the middle</span></div>
<div class="line"> <a class="code" href="classviennacl_1_1basic__range.html">viennacl::range</a> vcl_r3(dim_large - dim_small, dim_large); <span class="comment">// the last 'dim_small' entries</span></div>
<div class="line"> <a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub1(vcl_v1, vcl_r1); <span class="comment">// front part of vector v_1</span></div>
<div class="line"> <a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub2(vcl_v1, vcl_r2); <span class="comment">// center part of vector v_1</span></div>
<div class="line"> <a class="code" href="classviennacl_1_1vector__range.html">viennacl::vector_range<VCLVectorType></a> vcl_v1_sub3(vcl_v1, vcl_r3); <span class="comment">// tail of vector v_1</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> ublas_v1_sub1 = ublas_v2;</div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(ublas_v2, vcl_v1_sub1);</div>
<div class="line"> <a class="code" href="namespaceviennacl.html#a10b7f8cf6b8864a7aa196d670481a453">viennacl::copy</a>(vcl_v1_sub1, ublas_v2);</div>
<div class="line"></div>
<div class="line"> ublas_v1_sub1 += ublas_v1_sub1;</div>
<div class="line"> vcl_v1_sub1 += vcl_v1_sub1;</div>
<div class="line"></div>
<div class="line"> ublas_v1_sub2 += ublas_v1_sub2;</div>
<div class="line"> vcl_v1_sub2 += vcl_v1_sub2;</div>
<div class="line"></div>
<div class="line"> ublas_v1_sub3 += ublas_v1_sub3;</div>
<div class="line"> vcl_v1_sub3 += vcl_v1_sub3;</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">"ublas: "</span> << ublas_v1 << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"ViennaCL: "</span> << vcl_v1 << std::endl;</div>
<div class="line"></div>
<div class="line"> std::cout << <span class="stringliteral">"!!!! TUTORIAL COMPLETED SUCCESSFULLY !!!!"</span> << std::endl;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
<div class="line"></div>
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