What have you tried with g_analyze so far?  What was your result?  Is it what 
you expect?  If not, why isn't it what you expect?

Trying something out is far faster and you learn more than waiting for a 
response from others that don't know exactly what you are doing.

At a first look, the command you want to run is

g_analyze -f data.xvg -ac autocorr.xvg

as you have a data file with time (x) and variable (y) data and you want the 
autocorrelation function of the variable data.  Have you tried that command?

Catch ya,

Dr. Dallas Warren
Medicinal Chemistry and Drug Action
Monash Institute of Pharmaceutical Sciences, Monash University
381 Royal Parade, Parkville VIC 3010
[email protected]
+61 3 9903 9304
---------------------------------
When the only tool you own is a hammer, every problem begins to resemble a nail.

From: [email protected] [mailto:[email protected]] On 
Behalf Of aiswarya pawar
Sent: Tuesday, 27 September 2011 3:11 AM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] g_analyze doubt

Mark,

i read the help but i still didnt understand how do i compute the time series 
for this data, should i use this data as such for the input?

Thanks,
On Mon, Sep 26, 2011 at 12:44 PM, Mark Abraham 
<[email protected]<mailto:[email protected]>> wrote:
On 26/09/2011 5:10 PM, aiswarya pawar wrote:
HI Mark,

i have a .xvg data for the distance of two atoms in each time frame.


0.000000e+00  7.191033e-01
1.000000e+00  7.304224e-01
2.000000e+00  8.983867e-01
3.000000e+00  8.779736e-01
4.000000e+00  8.236583e-01
5.000000e+00  8.298320e-01
6.000000e+00  7.703011e-01
7.000000e+00  8.569826e-01
8.000000e+00  7.428180e-01
9.000000e+00  7.487683e-01
1.000000e+01  8.106729e-01
1.100000e+01  8.702058e-01
1.200000e+01  8.823072e-01
1.300000e+01  8.902194e-01
1.400000e+01  6.122664e-01
1.500000e+01  5.804662e-01
1.600000e+01  6.207849e-01
1.700000e+01  4.852896e-01
1.800000e+01  5.297776e-01
1.900000e+01  5.432515e-01
2.000000e+01  5.888653e-01
2.100000e+01  4.620140e-01


Now i want to find the autocorrelation of the time frame. so i should provide 
this file as such for input in g_analyze ie x as time and y as distance? or are 
there any criteria for the g_analyze input.

Have you read g_analyze -h and tried it out?


Mark
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