CODEWITHSUNDEEP
initializationeigen
Pedro Ferreira
Pedro Ferreira

Reputation: 860

Eigen::Matrix3Xd initialization using values from a vector

I'm trying to initialize a Eigen::Matrix3Xd with 3D values from a std::vector of an object that saves the x, y and z coordinates, from some code samples I do:

Eigen::Matrix3Xd matRef;
for (size_t i = 0; i < m_mapReference.size(); i++)
{
    matRef << m_mapReference[i].x, m_mapReference[i].y, m_mapReference[i].z;
}

And I have an error in runtime: System.NullReferenceException: 'Object reference not set to an instance of an object.'

If I add the size in the constructor of the Matrix3Xd: 

Eigen::Matrix3Xd matRef(10);

I have a compile error:
error C2338: YOU_TRIED_CALLING_A_VECTOR_METHOD_ON_A_MATRIX

What am I doing wrong?

Upvotes: 1

Views: 2167

Answers (1)

Pedro Ferreira
Pedro Ferreira

Reputation: 860

I'm having a bad day, this one is easy: 

        Eigen::Matrix3Xd matRef(3, mapCountFound);

Matrix3Xd is a semi dynamic matrix, where rows=3 is implicit, but we still have to put it in the initialization.
To fill it up: 

Eigen::Matrix3Xd matRef;
for (size_t i = 0; i < m_mapReference.size(); i++)
{
    matRef.col(i) << m_mapReference[i].x, m_mapReference[i].y, m_mapReference[i].z;
}

Upvotes: 3

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