On 4/2/20 12:53 PM, Alex wrote:
Dear all, By using the below setting I am getting a very nice umbrella histogram and iact also shows a very good integrated Autocorrelation time. However, the PMF profile is unexpected. Below I have also provided a gmx wham command I am using, part of the pullx.xvg of one of the windows and also corresponding part in log file. Would you please help me find out what the problem might be?
What is the problem?
One more question: does it make sense to manually shift the plateau of the PMF plot to zero (when we plot it), instead of using using the -zprof0 flag?
There is no difference. The -zprof0 just adds a constant so the PMF is zero at the specified point on the reaction coordinate.
%-------------------------------- pull = yes pull-ngroups = 2 pull-ncoords = 1 pull-group1-name = Mol_A pull-group2-name = Thin_film pull-coord1-groups = 1 2 pull-coord1-type = umbrella pull-coord1-dim = N N Y pull-coord1-start = no ;--> manually we define the distance for all windows pull-coord1-rate = 0.0 ;--> We don't want the roups to move pull-coord1-geometry = distance pull-coord1-k = 10000 ;;kJ/(mol nm^2) pull-print-components = Yes pull-nstxout = 2000 pull-nstfout = 2000 pull-print-com1 = yes pull-coord1-init = 1.650000 %------------------------------------ #Part of the one of the pullx.xvg file @ legend length 2 @ s0 legend "1" @ s1 legend "1 dZ" @ s2 legend "1 g 1 Z" @ s3 legend "1 g 2 Z" 0.0000 0.0155171 0.0155171 9.89805 9.91357 2.0000 0.0103956 0.0103956 9.90227 9.91266 4.0000 0.0146962 0.0146962 9.89733 9.91202 6.0000 0.00656533 0.00656533 9.90404 9.91061 8.0000 0.00228074 0.00228074 9.90945 9.91174 10.0000 0.00967605 0.00967605 9.90514 9.91482 .... %-------------------------------------------- gmx_mpi wham -hist Histo.xvg -nBootstrap 200 -bins 200 -bs-method b-hist -bsres bsResult.xvg -bsprof bsProfs.xvg -if Fpull.dat -it TPR.dat -ac -o profile.xvg -b 3000 -unit kCal -v %------------------------------------------------ #Similar massage as below I have for all windows (tpr files). Reading file prd.1.tpr, VERSION 2018.7 (single precision) File prd.1.tpr, 1 coordinates, with these options: Geometry distance k = 10000 position = 0 dimensions [N N Y] (1 dimensions). Used: Yes Pull group coordinates of 2 groups expected in pullx files. Reference value of the coordinate not expected in pullx files. Reading pull force file prd_pullf.1.xvg, expecting 2 columns: Columns for pull coordinate 1 reaction coordinate: 1 center-of-mass of groups: 0 reference position column: No Found 2501 times in prd_pullf.1.xvg %---------------------------------------------------------- Thank you, Alex
-- ================================================== Justin A. Lemkul, Ph.D. Assistant Professor Office: 301 Fralin Hall Lab: 303 Engel Hall Virginia Tech Department of Biochemistry 340 West Campus Dr. Blacksburg, VA 24061 jalem...@vt.edu | (540) 231-3129 http://www.thelemkullab.com ================================================== -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.