Hi Eduardo,  Value() cannot be used with a VectorImage. Try doing:<div><br></div><div>itk::VariableLengthVector&lt;float&gt; vec = oo.Get();</div><div>float value = vec[2]; </div><div><br></div><div>or</div><div><br></div>
<div>float vec = oo.Get()[2];</div><div><br><div><br><div class="gmail_quote">On Thu, Mar 24, 2011 at 12:13 PM, Eduardo Suarez-Santana <span dir="ltr">&lt;<a href="mailto:esuarez@itccanarias.org">esuarez@itccanarias.org</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">I&#39;d like to assign a component of a pixel of a VectorImage. I&#39;m trying<br>
to use the Value() method from an iterator without success. It works<br>
with Image type, but I get a compiler error with VectorImage.<br>
<br>
How can I assign just one component of a VectorImage?<br>
<br>
Thanks,<br>
-Eduardo<br>
<br>
<br>
++++++++++++++++ testVector.cxx<br>
#include &quot;itkImageRegionIterator.h&quot;<br>
#include &quot;itkVectorImage.h&quot;<br>
<br>
int main(int argc, char *argv[] )<br>
{<br>
<br>
  typedef itk::VectorImage&lt;float,2&gt; ImageType;<br>
  //typedef itk::Image&lt;float,2&gt; ImageType;<br>
<br>
  ImageType::Pointer image = ImageType::New();<br>
<br>
  ImageType::SizeType regionSize;<br>
  regionSize[0] = 5;<br>
  regionSize[1] = 4;<br>
<br>
  ImageType::IndexType regionIndex;<br>
  regionIndex[0] = 0;<br>
  regionIndex[1] = 0;<br>
<br>
  ImageType::RegionType region;<br>
  region.SetSize(regionSize);<br>
  region.SetIndex(regionIndex);<br>
<br>
  // comment next line to try with itk::Image<br>
  image-&gt;SetVectorLength( 5 );<br>
  image-&gt;SetRegions( region );<br>
  image-&gt;Allocate();<br>
<br>
  itk::ImageRegionIterator&lt;ImageType&gt; oo( image, region );<br>
<br>
  oo.GoToBegin();<br>
  while( !oo.IsAtEnd() )<br>
  {<br>
      // what I would like to do is something like<br>
      //oo.Value()[2]=29837.0;<br>
<br>
      // next line prints a compiler error when using VectorImage<br>
      oo.Value();<br>
      ++oo;<br>
  }<br>
<br>
}<br>
<br>
+++++++++++++++ CMakeLists.txt<br>
cmake_minimum_required(VERSION 2.6)<br>
<br>
find_package(ITK)<br>
if(ITK_FOUND)<br>
  include(${ITK_USE_FILE})<br>
else(ITK_FOUND)<br>
  message(FATAL_ERROR &quot;Please set ITK_DIR.&quot;)<br>
endif(ITK_FOUND)<br>
<br>
project(testVector)<br>
<br>
add_executable(testVector testVector.cxx)<br>
target_link_libraries(testVector ${ITK_LIBRARIES})<br>
<br>
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</blockquote></div><br></div></div>