Some common syntax changes

NuTo::FullMatrix	Eigen::Matrix
GetValue(i,j) / GetValue(i)	(i,j) / (i)
SetValue(i,j,x) / SetValue(i,x)	(i,j) = x / (i) = x
GetNumRows() / GetNumColumns()	rows() / cols()
GetRow(i) / GetColumn(i)	row(i) / col(i)
SetRow(i, x) / SetColumn(i, x)	row(i) = x / col(i) = x
Resize()	resize()
Sum()	sum()
Norm()	norm()
Abs()	cwiseAbs()
Max()	maxCoeff()
Dot()	dot()
matrix.ConservativeResizeRows(newNumRows)	matrix.conservativeResize(newNumRows, matrix.cols())
Trans()	transpose()

*PITFALLS*

• Eigen::Matrix does not perform a resize when calling
  • Eigen::Matrix::resize(...)
  • Eigen::Matrix<..>(dimX, dimY) (ctor)

Example 1)

eigenVector.resize(3);
eigenVector << 1,2,3;

setZero not needed, since you set each value. Consider RAII...

Example 2)

Eigen::VectorXd result(3);
for (...)
    result += someOtherVectors

setZero required.