Hi Peixiang,
Welcome to the relax mailing lists! The relaxation dispersion
analysis implemented in relax is quite flexible, and the data you have
is supported. This is well documented in the relax manual which you
should have with your copy of relax (the docs/relax.pdf file). Have a
look at section 'The R2eff model' in the dispersion chapter of the
manual (http://www.nmr-relax.com/manual/R2eff_model.html),
specifically the 'Variable relaxation period experiments' subsection.
Unfortunately the sample scripts are all for the fixed time dispersion
experiments. However you could have a look at one of the scripts used
for the test suite in relax:
test_suite/system_tests/scripts/relax_disp/exp_fit.py
This script is run in the test suite to ensue that the data you have
will always be supported. There are many more scripts in that
directory which you might find interesting. The 'r1rho_on_res_m61.py'
script also involve an exponential fit with many different relaxation
time periods.
You could also try using the relax graphical user interface (GUI) by running:
$ relax -g
Here you simply load the peak list data via the 'Add' button in the
'Spectra list' GUI element and, when you reach the relaxation time
wizard page, simply specify different times for the different spectra
- relax will handle the rest. Have a look at
http://www.nmr-relax.com/manual/Dispersion_GUI_mode_loading_data.html
(the GUI section of the dispersion chapter). The GUI should be much
easier to use than the script UI, though a lot less flexible if you
wish to perform custom, non-standard analyses.
Regards,
Edward
On 19 May 2014 16:25, pma <Peixiang.Ma@xxxxxx> wrote:
Hi, all,
Did anybody manage to fit the R1rho relaxation dispersion from some
calculated R2 data (e.g. I fitted the different relax_delay time to extract
R1rho, then calculate R2 = R1rho/sin^2 - R1/tan^2 )
I found a tutorial on wiki, but it stopped after processing the spectra,
actually I finished this part already. Besides,in the manual for R1rho calc
(page 173 in the manual) in the R2eff model, it defined
R1rho(w1)=-1/T*ln(I1(w1)/I0), e.g. it assume the mono-dispersion between
time 0 and a fix time point. We did a bit different, we recorded a series of
time points and got the R1rho for each w1.
Now I have all the R2s, I want to use the implemented R1rho models to fit my
data.
I think relax should be possible to do the fitting with custom calculated
R2, what kind of format should I use? Can anyone show an example of import
file and the processing scripts? Then I could reformat my data to the
template format.
Now my data looks like the following: for each RF_frq the R2 has such format
res_num w1(Hz) value error
1 1200 30.7734534261 2.68087025208
1 2000 23.0503960923 1.53567705225
...................
Thanks a lot!
Peixiang
On 05/16/2014 02:18 PM, relax-users-request@xxxxxxx wrote:
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Re: R1rho RD analysis