Pca contribution per atom numbers

User discussions
1

GROMACS version: 2021
GROMACS modification: No

In the “anaeig” analysis tool there is an option “-comp” for getting the vector components by atom. I got a plot (using the first PC only) where the y axis reads “vec 1”, are the units of this axis in nm? Or maybe this axis doesn’t have units? Thank you.

2

An eigenvector is dimensionless. The components are normalized such that the eigenvector has length 1.