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gmx-morph - Interpolate linearly between conformations


gmx morph [-f1 [<.gro/.g96/...>]] [-f2 [<.gro/.g96/...>]] [-n [<.ndx>]]
[-o [<.xtc/.trr/...>]] [-or [<.xvg>]] [-[no]w]
[-xvg <enum>] [-ninterm <int>] [-first <real>]
[-last <real>] [-[no]fit]


gmx morph does a linear interpolation of conformations in order to create intermediates.
Of course these are completely unphysical, but that you may try to justify yourself.
Output is in the form of a generic trajectory. The number of intermediates can be
controlled with the -ninterm flag. The first and last flag correspond to the way of
interpolating: 0 corresponds to input structure 1 while 1 corresponds to input structure
2. If you specify -first < 0 or -last > 1 extrapolation will be on the path from input
structure x_1 to x_2. In general, the coordinates of the intermediate x(i) out of N total
intermediates correspond to:

x(i) = x_1 + (first+(i/(N-1))*(last-first))*(x_2-x_1)

Finally the RMSD with respect to both input structures can be computed if explicitly
selected (-or option). In that case, an index file may be read to select the group from
which the RMS is computed.


Options to specify input files:

-f1 [<.gro/.g96/...>] (conf1.gro)
Structure file: gro g96 pdb brk ent esp tpr

-f2 [<.gro/.g96/...>] (conf2.gro)
Structure file: gro g96 pdb brk ent esp tpr

-n [<.ndx>] (index.ndx) (Optional)
Index file

Options to specify output files:

-o [<.xtc/.trr/...>] (interm.xtc)
Trajectory: xtc trr cpt gro g96 pdb tng

-or [<.xvg>] (rms-interm.xvg) (Optional)
xvgr/xmgr file

Other options:

-[no]w (no)
View output .xvg, .xpm, .eps and .pdb files

-xvg <enum>
xvg plot formatting: xmgrace, xmgr, none

-ninterm <int> (11)
Number of intermediates

-first <real> (0)
Corresponds to first generated structure (0 is input x_1, see above)

-last <real> (1)
Corresponds to last generated structure (1 is input x_2, see above)

-[no]fit (yes)
Do a least squares fit of the second to the first structure before interpolating

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