[gmx-users] covar warning

[venkat]

Hi,
For PCA analysis  i tried to run covar tool for my task, i got following
warning ​
"​
WARNING: there are fewer frames in your trajectory than there are
​ ​
​
degrees of freedom in your system. Only generating the first
​ ​
400 out of 3564 eigenvectors and eigenvalues.
​"​
Why it generating 400  out of 3564 eigevectors,  How rectify this warning ?
kindly help .  (Command used : gmx_mpi covar -s prot_only-apo.pdb -f
PROTEIN.xtc -v eigenvect.trr -xpma covara.xpm)

Thank you