I have installed v5 of GROMACS and am doing simulations on a peptide VPGVG repeated five times. I am trying to calculate entropy and the eigenvalues of the covariance matrix to get eigenfrequencies. When I issue the command gmx covar -f full.trr -s full.tpr -v -o -mwa (for eigenvalues), I get an empty eigenvalues.xvg. In GROMACS v4.5.5 I used to get the eigenvalues outputted, for the same data sets, same command (g_covar). It says it's writing the eigenvalues, but when I open the file there are no eigenvalues there, only the preamble for the xvg file, ending at @TYPE xy. What am I doing wrong or is this a bug?
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