Hi Lisa,<div><br></div><div><br></div><div>The only embarrassing questions </div><div>are those that are left unasked :-)<br><br><br>At this point we don't really have an ITK</div><div>class that encompasses the concept of</div>
<div>an "Array of Vectors", although you can</div><div>construct it with existing classes.<br><br>May I presume that the norm that you want</div><div>to compute for the Array of Vector is the </div><div>Sum of norms of all the Vectors in the array ?</div>
<div><br></div><div>If so, at this point the easy way to do this</div><div>would be to Instantiate an Array of Vectors,</div><div><br></div><div>and do a for loop visiting all the elements...</div><div><br></div><div>As Array classes you could use the:</div>
<div><br></div><div>typedef itk::Vectors< float, N > VectorType;</div><div><br></div><div>...</div><div><br></div><div>itk::Array< VectorType ></div><div><br></div><div>or</div><div><br></div><div>itk::VectorContainer< VectorType ><br>
<br>or simply one of the STL containers</div><div><br></div><div>std::list< VectorType ></div><div>std::vector< VectorType ><br><br>The code could look like:</div><div><br></div><div>typedef std::vector< VectorType > ArrayOfVectorType;</div>
<div><br></div><div>ArrayOfVectorType array = this->GetArraySomehow();<br><br>ArrayOfVectorType::const_iterator itr = array.begin();</div><div><br></div><div>double sum = 0.0;</div><div>while( itr != array.end() )</div>
<div> {</div><div> sum += itr->GetNorm();</div><div> ++itr;</div><div> }</div><div><br></div><div>std::cout << sum << std::endl;</div><div><br></div><div><a href="http://www.itk.org/Doxygen/html/classitk_1_1Vector.html#a0f103636ffc85fd3df1ae6c838d3e70e">http://www.itk.org/Doxygen/html/classitk_1_1Vector.html#a0f103636ffc85fd3df1ae6c838d3e70e</a> <br>
<br><br>Depending on your definition of norm</div><div>for an array of vectors, the code above</div><div>may need some retouching.<br><br><br> HTH</div><div><br></div><div><br></div><div> Luis<br><br><br>------------------------------------------------------<br>
<div class="gmail_quote">On Tue, May 22, 2012 at 2:06 AM, Lisa Dean <span dir="ltr"><<a href="mailto:lisadean.leo@gmail.com" target="_blank">lisadean.leo@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br><div><br></div><div>Hi Users,</div><div><br></div><div><br></div><div>Forgive the embarrassingly basic question, but how do I find the squared norm of an itk array of vectors?</div><div><br></div><div><br></div><div><br>
</div><div>Thanks for the help</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Lisa</div>
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