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<DIV>Dear all<BR>I made parameters of my force field for BCN by own that contains :<BR>.atp .rtp .itp .n2t files and put these files in working directory when I used</DIV>
<DIV> g_x2top -f conf.gro -o -ff command for generating top file faced with this error :<BR>Expected a string argument for option -ff</DIV>
<DIV><BR>then I deleteed files relating to charm force field and I copied them (my force field files) in charm.ff in ... /share/gromacs/top and use g_x2top but charmm force field was deleted from list.</DIV>
<DIV>in older version of gromacs such as 4.0.7, there was a file named FF.dat in which there are a list of force field being in top directory, while there is not FF.dat file in 4.5 version of gromacs. thus, if I want to add a new force field to top directory (as I can use it for g_x2top -ff), how to do that? </DIV>
<DIV> any help will highly appreciated.<BR><BR></DIV></TD></TR></TBODY></TABLE></DIV></TD></TR></TBODY></TABLE></DIV></td></tr></table><br>