[gmx-users] g_rmsdist error hi (-1000.000000) <= lo (0.000000)

2011-04-29 Thread Andrea Carotti

Hi all,
I'm trying to use this tool with the following command (selecting the 
backbone atoms: 366 atoms in total)

 g_rmsdist -s 1.pdb -f traj_fit.trr -rms

But the programs stop with the following error:
Program g_rmsdist, VERSION 4.5.4
Source code file: matio.c, line: 953

Fatal error:
hi (-1000.00) <= lo (0.00)
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors

Could you please help me?
Thanks
Andrea



--


¯¯¯¯
Andrea Carotti
Dipartimento di Chimica e Tecnologia del Farmaco
Università di Perugia
Via del Liceo, 1
06123 Perugia, Italy
phone: +39 075 585 5169
fax: +39 075 585 5161
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[gmx-users] g_sas with pbc

2009-11-03 Thread andrea carotti
Hi all,
I've already simulated 27 organic molecules in a cubic solvent box. Now
I would like to calculate the SAS of this system. I've a tpr and a trr
with only the molecules inside (without water).
I'm using gromacs 4.0.5.
I've added the box dimension infos to the trr using the command:
trjconv -f ../../original_multi3000.pdb -o new.trr -s reference.pdb -box
7.3973   7.3973   7.3973
In the reference.pdb  I've also the CRYST informations.
I've modified the gmx_sas.c to bypass the check that turn off
automatically the PBC if solvent molecules are not present.
Unfortunately I've seen that the results with and without taking into
account the PBC are identical.
So my questions are:
1) Is it possible to use the g_sas tool to calculate the SAS of this
kind of system?
2) There are some tricks or trasformations or missing informations in my
input(s) that I could fill before running the analysis?
3)Should I use another type of box? Trasform the trajectory with some
pbc keywords (I've also tried -ur compact without luck)...

Thanks in advance and sorry for the long message
Andrea




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[gmx-users] Variance in ED

2009-03-13 Thread andrea carotti
Dear Dr. Wassenaar,
many thanks for your kind reply.
Andrea


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Andrea Carotti
Dipartimento di Chimica e Tecnologia del Farmaco
Università di Perugia
Via del Liceo, 1
06123 Perugia, Italy
phone: +39 075 585 5169
fax: +39 075 585 5161
www http://rpg.unipg.it
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[gmx-users] Variance in ED

2009-03-12 Thread andrea carotti
Hi all,
perhaps a silly question but i didn't find the correct way to calculate
the variance explained by each eigenvec in ED analysis.
Could someone point me out to a correct tool/option to use.
I'm using gmx v3.3.
Many thanks
Andrea
-- 
¯¯¯¯¯¯¯¯
Andrea Carotti
Dipartimento di Chimica e Tecnologia del Farmaco
Università di Perugia
Via del Liceo, 1
06123 Perugia, Italy
phone: +39 075 585 5169
fax: +39 075 585 5161
www http://rpg.unipg.it
personal www http://iris.chimfarm.unipg.it/users/andcar

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[gmx-users] xpm to ascii

2007-10-04 Thread andrea carotti
Hi all,
I would like to have a txt file from an xpm matrix generated by g_rms or
g_cluster. Someone has already done this?
I've seen in the previous posts some hints about hacking the code or
scripts usefull for g_covar...but I'm not so confortable and expert to
do such things without a step by step guru guide...
Thanks
Andrea 


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Re: [gmx-users] g_rms

2007-10-03 Thread andrea carotti
> So does the -Rmat option not produce a human-readable text file?
Hi, unfortunately I can't see this option in g_rms.
I'm using the v 3.3.1 and also on the reference page online there is not
-Rmat. Am i missing something?
Thanks
Andrea


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Re: [gmx-users] g_rms

2007-10-03 Thread andrea carotti
Hi again,

> If you read g_rms -h like I suggested last time, you'll see that -f2 and 
> -s serve the same purpose with the former using a trajectory and the 
> latter a single structure. That document doesn't say what happens when 
> you use both... but the operation you're trying to do doesn't need both!
the -h option is my standard first step when i use all the gmx-tools and I've 
read and done it like every time.
I've tried to use -f2 option without using the -s and it comes out with the 
error "topol.tpr not found" so it's not "so optional", but it's needed also 
when using the -f2 option..
I've alsto tried to use the -s with my traj without using the -f2 option but it 
creates a matrix 2200x2200.
However the problem still remain unsolved or misunderstanded.
If i use the my only working command line
g_rms -f 2200.pdb -f2 33.pdb -s ref.pdb -n -o -m -bin 

I obtain a rmsd.xvg with 2 columns. So, which is the meaning of that value? a 
mean of all the rmsd calculated for that frame in respect to the other 33 refs?
Thanks
Andrea

-- 

Andrea Carotti
Dipartimento di Chimica e Tecnologia del Farmaco
Via del Liceo, 1
06123 Perugia, Italy
phone: +39 075 585 5169
fax: +39 075 585 5161
www http://rpg.unipg.it
personal www http://iris.chimfarm.unipg.it/users/andcar

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Re: [gmx-users] g_rms

2007-10-03 Thread andrea carotti
Hi,
> You should be getting such a 2200x33 matrix. My guess is that the 
> command line or files that you're using are not what you think they
> are :-)
my command line is 

g_rms -f 2200.pdb -f2 33.pdb -s ref.pdb -n -o -m -bin 

Note that the pdbs (traj and ref) have the same number of atoms (same
structure).
During the calculation i can see that it is creating the 2200x33 matrix,
but on the rmsd.xvg i find only two columns. From the xpm and dat files
i can't extract the matrix (i don't know) to a text file.
I hope this could clarify better my question
Thanks
Andrea



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[gmx-users] g_rms

2007-10-02 Thread andrea carotti
Hi and thanks for answering to my previous question.
Now I'm calculating the rmsd between two trajectories (-f2 option).
One is made by 2200 frames and the other has 33 frames..Now I've some
doubt about the output (rmsd.xvg), cause this file has only two columns
with 2200 rows ...i was imaging that it should have 2200 rows and 33
columns, am I wrong? 
The second question is something that is already been asked before..it
could be usefull to obtain the matrix 2200 x 33 in a human readable
file. Is it possible without hacking the code? Perhaps using external
scripts? 
Thanks a lot again
Andrea

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[gmx-users] g_cluster questions

2007-10-02 Thread andrea carotti
Hi all,
I'm using this tool to cluter 2200 structures in this way:
fitting on the backbone, rmsd calculated on key residues (10) of the
Binding site.
Now I created the correct group in the index file and using the
g_cluster giving the trajectory as input i can only choose one group for
fitting and rmsd calculation..So I've tried also to fit the trajectory
before to use it in g_cluster with the option -fit (to jump the fitting
step and choose directly the group for the rmsd calculation; i've tried
also -fit no) but it seems that the program ignore it (on screen, during
the group selection it asks for the "fitting and Rmsd group" and on -fit
line i can see yes)...SO my next strategy is been to calculate the xpm
matrix with g_rms, fitting on the backbone and calculating the rmsd
values on the Bindingsite group. Then I've used the xpm as input in the
g_cluster, but it asks me however for a group for the LSfitting..could
someone explain me this behaviour?
Is my procedure correct for my purpose? Is normal that g_cluster does
not accept the -fit option?
Thanks 
Andrea
-- 
¯¯¯¯¯¯¯¯
Andrea Carotti
Dipartimento di Chimica e Tecnologia del Farmaco
Via del Liceo, 1
06123 Perugia, Italy
phone: +39 075 585 5169
fax: +39 075 585 5161
www http://rpg.unipg.it
personal www http://iris.chimfarm.unipg.it/users/andcar

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[gmx-users] psf 2 top

2007-09-05 Thread andrea carotti
Hi all,
I've performed my MD simulations using the charmm FF and NAMD (so
pdb,psf and dcd files). Now i would like to use the great GMX analysis
tools. I've successfully converted the dcd file in trr (using catDCD).
Now the next step I'd like to do is the psf to top conversion. I've seen
on the vmd site that a top2psf script is present but it not do the
reverse conv that i need. I would prefer to not pass through pdbs.I
would like to do this to not loose corrispondences of atoms and to not
miss parameters for not typical residues that I'm using (like
phosphrilated serines).
Is there someone that could help me on this topic?
Thanks in advance
Andrea


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[gmx-users] g_hbond -contact option

2006-11-22 Thread andrea carotti
Hi all,
I have found this interesting option in g_hbond, and I would like to
know something more about it. How does it work? Which is the difference
with other tools like g_dist?
Thanks to all
Andrea

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[gmx-users] Re: g_hbond error "Your computational box has shrunk too much"

2006-10-18 Thread andrea carotti
The problem is that i don't have an energy file cause this time I'm
using gromacs only for analyze my trajs...so I don't know how to make
the plot you suggested. Now perhaps I've found a workaroud using trjconv
with the option -box 1 1 1 set, but I' don't know if this could be
correct.
(I've checked the ouput traj in VMD and seems fine, and with it g_hbond
is working)
Best
Andrea 
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[gmx-users] Re: g_hbond error "Your computational box has shrunk too much"

2006-10-18 Thread andrea carotti
> Is it correct? Did you plot the box volume as a function of time?
> You can use g_hbond for different stretches of the trajectory and 
> combine the results manually.
> -- 
Thanks for the fast reply.
I'm only trying to monitor the hbond formation with the " basic" command
g_hbond -f m93_newtraj.trr -s topol.tpr -n
and giving to the groups selection two different parts of my protein (i've made 
an index file)..and then the programs suddenly stop.
the default output (-num) should be the total number of hbond per frame.
Please help me again
Andrea



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[gmx-users] g_hbond error "Your computational box has shrunk too much"

2006-10-18 Thread andrea carotti
Hi all,
I'm beginning to analyze my trajectories, everything works fine with
(g_rmsf, g_saltbr ...) but when i try to use g_hbond I receive this
error:
--
Program g_hbond, VERSION 3.3.1
Source code file: gmx_hbond.c, line: 631

Fatal error:
Your computational box has shrunk too much.
g_hbond can not handle this situation, sorry.

---
Is this a bug or a problme with my system? Is there the possibility to
avoid this problem in some way?
THANKS
Andrea


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[gmx-users] Reordering problem AMBER to GROMACS

2006-10-17 Thread andrea carotti
Hi all gmxers,
I'm trying to analyze an amber dynamic (v.8) with the gromacs tools
(last version). Sorry in advance for the long message.
To do so, I'm trying to generate also a tpr file (needed by some tools).
My procedure is being to convert all the MD in multiple pdb format.
So I have extracted the first frame to generate a .top file. So I've
converted the pdb res atom names that didn't match the OPLS-All atom FF
(6th option):
sed -e "/ATOM/s/HIE/HIS/g" -e "/ATOM/s/NME/NAC/g" -e "/ATOM/s/HB3
GLU/HB1 GLU/g" -e  "/ATOM/s/HG3 GLU/HG1 GLU/g" -e "/ATOM/s/HB3 LEU/HB1
LEU/g" -e "/ATOM/s/HB3 ASP/HB1 ASP/g" -e "/ATOM/s/HG3/HG1/g" -e
"/ATOM/s/HG13 ILE/HG11 ILE/g" -e "/ATOM/s/HD3 LYS/HD1 LYS/g" -e
"/ATOM/s/HE3 LYS/HE1 LYS/g" -e "/ATOM/s/HD3 ARG/HD1 ARG/g" -e
"/ATOM/s/HD3 PRO/HD1 PRO/g" -e "/ATOM/s/HA3 GLY/HA1 GLY/g" pdb_orig.pdb
> pdb_ok.pdb
This made pdb2gmx work without problems generating  .top and .gro
files...so with these files i will generate a tpr file.
Now the problem is that the atom order is different between the gro file
and the multiple pdb file (the original trajectory). Is there a way to
make the trajectory (original) in the correct order (that comes from the
gromacs new files)? If yes, please tell me a solution in a step-by-step
way. Many thanks to all 
Andrea





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Re: [gmx-users] Paralellization limit?

2006-04-19 Thread Andrea Carotti

Hi Carsten,
thanks for your quick reply.
Could you plese confrim me that gromacs 3.3.1 works and compile fine with 
mpich 2.x?
Cause this is the first time that I hear that from a user and I'll go ahead 
on this way instead of usin LAM.

Thanks again
Andrea
- Original Message - 
From: "Carsten Kutzner" <[EMAIL PROTECTED]>

To: "Discussion list for GROMACS users" 
Sent: Wednesday, April 19, 2006 2:15 PM
Subject: Re: [gmx-users] Paralellization limit?



Hi Andrea,

Andrea Carotti wrote:

Hi all,
I'm trying to simulate a system with two identical proteins (42aa each 
one), solvent spc (18430 mols) and 6 ions NA+...for a total of  ~56100 
atoms.
Now the "problem" is that if I run the MD on 4 nodes everything works 
fine, but when I try to use 6 or 8 cpus the process stops on the master 
and continue only on the last two slaves (4 cpus, the systems are dual 
xeon). The problem is that I can't find any error message on the log 
files.
I've tried using the d.dppc benchmark files, and all goes fine with 2-4-6 
and 8 cpus.
So my question is: is there a limit of parallelization in gromacs 
depending on the simulated system?

I'm using gromacs 3.3.1, mpich 1.2.5.2 and fftw 2.1.5.


I have encountered similar problems when using mpich 1.2.x on
Ethernet. Upgrading to mpich-2.x or using LAM solved the problems.
There is only a parallelisation limit in the sense that using more
CPUs does not always result in faster execution. 56 k atoms should
run happily on 8 CPUs.

Good luck,
  Carsten
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[gmx-users] Paralellization limit?

2006-04-19 Thread Andrea Carotti

Hi all,
I'm trying to simulate a system with two identical proteins (42aa each one), 
solvent spc (18430 mols) and 6 ions NA+...for a total of  ~56100 atoms.
Now the "problem" is that if I run the MD on 4 nodes everything works fine, 
but when I try to use 6 or 8 cpus the process stops on the master and 
continue only on the last two slaves (4 cpus, the systems are dual xeon). 
The problem is that I can't find any error message on the log files.
I've tried using the d.dppc benchmark files, and all goes fine with 2-4-6 
and 8 cpus.
So my question is: is there a limit of parallelization in gromacs depending 
on the simulated system?

I'm using gromacs 3.3.1, mpich 1.2.5.2 and fftw 2.1.5.
Thanks in advance
Andrea

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Re: [gmx-users] replica exchange doubt

2006-04-11 Thread Andrea Carotti

Hi all,
I've another question, in the manual  (page 39) a REMD calculator is 
mentioned.

Where is it? I've tried to search it on the website  without success.
Thanks again
Andrea 


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Re: [gmx-users] replica exchange doubt

2006-04-11 Thread Andrea Carotti

Thanks to all for the quick clarifications.
Andrea

- Original Message - 
From: "Xavier Periole" <[EMAIL PROTECTED]>

To: "Discussion list for GROMACS users" 
Sent: Tuesday, April 11, 2006 1:55 PM
Subject: Re: [gmx-users] replica exchange doubt



Andrea Carotti wrote:


Hi all gmx-ers,
I have a doubt concerning the REMD setup. Let's say I want to use 12 
cpus to make a REMD at 2 different temp 300 and 400K of the same system.

Should I prepare every tpr file with the -np option set to 6?
and then run the mdrun with -np 12 -multi -s 300.tpr 400.tpr -replica 
X -reseed?


I don't think that running each replica on more than one cpu is 
implemented !!


The last doubt: is it possible/supported to make a REMD with an 
Umbrella sampling (a force between 2 centers of mass)associated?

Thanks a lot



--
--
Xavier Periole - Ph.D.

Dept. of Biophysical Chemistry / MD Group   
Univ. of Groningen

Nijenborgh 4
9747 AG Groningen
The Netherlands

Tel: +31-503634329
Fax: +31-503634398
email: [EMAIL PROTECTED]
web-page: http://md.chem.rug.nl/~periole
--

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[gmx-users] replica exchange doubt

2006-04-11 Thread Andrea Carotti

Hi all gmx-ers,
I have a doubt concerning the REMD setup. Let's say I want to use 12 cpus to 
make a REMD at 2 different temp 300 and 400K of the same system.

Should I prepare every tpr file with the -np option set to 6?
and then run the mdrun with -np 12 -multi -s 300.tpr 400.tpr -replica 
X -reseed?
The last doubt: is it possible/supported to make a REMD with an Umbrella 
sampling (a force between 2 centers of mass)associated?

Thanks a lot
Andrea

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Re: [gmx-users] How to install MPI version of Gromacs on a Linux Cluster

2006-03-27 Thread Andrea Carotti

Hi,
Here http://www.gromacs.org/documentation/howtos/mpich_howto.html you'll 
find an interesting solution for you..

Bye
Andrea
- Original Message - 
From: "Shankar Prasad Kanaujia" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>
Cc: 
Sent: Monday, March 27, 2006 8:03 AM
Subject: [gmx-users] How to install MPI version of Gromacs on a Linux 
Cluster




Dear Gromacs Users,
I am a new user of gromcas. But I have problem in installing mpi
version of gromacs on a cluster which has the following
configurations:
1. It has 8 nodes.
2. Each node has PIV 3.4 GHz and having 2 GB RAM.
3. Redhat Enterprise Linux 4.0
4. MPICH-1.2.5 version

I do not know how to install MPI version of Gromacs. What files I need to
edit.

I request you all to kindly tell me the steps to install MPI version of
gromacs on the cluster. (Note: I am able to install gromacs on a single
processor machine.)

I would be highly grateful for the same.
Thanking you.

Yours Sincerely,
--
Shankar Prasad Kanaujia
Ph.D Student
Bioinformatics Center, Department of SERC
IISc, Bangalore - 12
Mobile: 9845631581

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[gmx-users] AFM pulling

2006-03-17 Thread Andrea Carotti

Hi all,
I am a bit confused about some points on the manual (section 6.1, manual 
3.2). I f i define two groups: one that will be pulled and the other as 
reference group; then the force constant and the rate, must i define also 
the afm_dir and the afm_unit? In my mind, if i define two groups (centers) 
in the space, they will define a vector where the spring will be placed and 
then I'll set also the strenght of pulling and its movement (rate). Could 
someone give me some hints or comments about?

Many thanks
Andrea 


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Re: [gmx-users] Gromacs 3.3 manual

2006-03-17 Thread Andrea Carotti

Thank you for the fast answer.
Please let me (us) know, when it will be fixed.
Thanks
Andrea
- Original Message - 
From: "David van der Spoel" <[EMAIL PROTECTED]>

To: "Discussion list for GROMACS users" 
Sent: Friday, March 17, 2006 11:23 AM
Subject: Re: [gmx-users] Gromacs 3.3 manual



Andrea Carotti wrote:

Hi all,
I'm trying to create the manual from the cvs repository suing the 
command:

cvs -z3 -d :pserver:[EMAIL PROTECTED]:/home/gmx/cvs co manual
and then using the README file on that dir created. But I'm encountering 
a lot of errors and problem ending with a creation of an unreadable pdf.
I'm using a linux box with Fedora core 2. Could someone share with me a 
working pdf or ps manual? or eventually guide me through a successfull 
creation of it?

sorry itäs broken right now. will fix it ASAP.


Many thanks in advance
Andrea
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--
David.

David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
Dept. of Cell and Molecular Biology, Uppsala University.
Husargatan 3, Box 596,  75124 Uppsala, Sweden
phone: 46 18 471 4205 fax: 46 18 511 755
[EMAIL PROTECTED] [EMAIL PROTECTED]   http://folding.bmc.uu.se

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[gmx-users] Gromacs 3.3 manual

2006-03-17 Thread Andrea Carotti

Hi all,
I'm trying to create the manual from the cvs repository suing the command:

cvs -z3 -d :pserver:[EMAIL PROTECTED]:/home/gmx/cvs co manual
and then using the README file on that dir created. But I'm encountering a 
lot of errors and problem ending with a creation of an unreadable pdf.
I'm using a linux box with Fedora core 2. Could someone share with me a 
working pdf or ps manual? or eventually guide me through a successfull 
creation of it?

Many thanks in advance
Andrea 


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