[Insight-users] dot product of itk vector was completely wrong

[Bradley Lowekamp]

http://www.itk.org/Doxygen/html/classitk_1_1Vector.html

The return type for the operator* for a dot product is Vector::ValueType, a scalar, not a vector.
http://www.itk.org/Doxygen/html/classitk_1_1Vector.html#a51bad5a3835ffc0fbbc02d5437f7e691

By assigning to to a new Vector are implicitly calling this constructor:
http://www.itk.org/Doxygen/html/classitk_1_1Vector.html#a106ee9550311054cceb66015e98c6457

The example is wrong. Watch your types. 

Brad

On Feb 11, 2014, at 2:46 PM, WANG Chengjia <wangchengjia1986 at gmail.com> wrote:

> Hi, 
> 
> I'm not sure whether this is a bug, but I had two itk::vector<double, 3> and when I printed them out, one of them are [0 0 1], the other one is [0 0 4]. I follow the example given in http://www.itk.org/Wiki/ITK/Examples/Math/DotProduct
> (directly multiply the two vector using '*')
> and finally I got a inner product of them as [ 4 4 4], which is completely wrong. 
> 
> Is there something wrong in version 4.5?
> 
> Best,
> Chengjia
> 
> -- 
> Chengjia Wang
> Phd Student, 
> University of Edinburgh
> Clinical Research Imaging Center (CRIC)
> Toshiba Medical Visualization Systems Europe, Ltd
> Email: wangchengjia1986 at gmail.com
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