Hi, <br><br><div><span class="gmail_quote">On 6/6/07, <b class="gmail_sendername">Georg Baum</b> <<a href="mailto:Georg.Baum@gmx.de">Georg.Baum@gmx.de</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Am Mittwoch, 6. Juni 2007 22:23 schrieb Server Levent Yilmaz:<br><br>> What is a proper way, if any, to adapt a ublas (dense) vector around a<br>> legacy pointer to data?<br><br>Something like this should work:<br><br> #include <boost/version.hpp><br>#if BOOST_VERSION >= 103400<br>typedef boost::numeric::ublas::carray_adaptor<double> array_adaptor;<br>#else<br>typedef boost::numeric::ublas::array_adaptor<double> array_adaptor; <br>#endif<br>typedef vector<double, rcarray_adaptor> array_vector;<br><br><br>Replace double with the datatype you need. Then you can use array_vector<br>like this:<br><br>int n = 5;<br>double *array = new double[5]; <br><br>array_vector v;<br>v.data().resize(n, array);</blockquote><div><br><br>This is interesting (and obviously works, thank you).. Yet, I can not help but mention that the interface of array_adaptor is quite counter-intuitive. For instance the following : <br><span style="font-family: courier new,monospace;"><br>array_vector v(n, array_adaptor(n,array))</span>;<br><br>ends up NOT using the adapted pointer but allocating its own space... Some reading of the source code reveals that array_adaptor is curiously trying to manage its own memory whenever it can (for example at copy construction)... Isn't that the job of unbounded_array? Isn't the whole purpose of array_adaptor is to delegate memory management _wholly_ to the user? (this is no rhetoric, really, what else is array_adaptor used for?) <br><br>And curiously asking if I may, why did carray_adaptor removed? (renamed?) <br><br>L. <br></div></div><br clear="all"><br>-- <br>Server Levent Yilmaz<br>Mechanical Engineering<br>University of Pittsburgh