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Welcome to the relax Wiki.
The community-run support site for relax, a program for the study of molecular dynamics using experimental NMR data.
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What's new?

News & Updates
Migration to SourceForge After the Gna! shutdown at the start of 2017, relax has finally in 2019 been fully migrated to the SourceForge infrastructure.
Gna! is permanently shut down! A migration to another open source infrastructure is planned. This will include web hosting for, source code repositories, bug and other trackers, new reports, download pages, and possible a svn to git conversion.
Tutorial added Tutorial for sorting data stored as numpy to on-resonance R1rho analysis
Version 4 of relax With the latest relax release merging in years of developments in the frame order analysis, the major number has been incremented to relax 4.
Tutorial added Tutorial for manual regarding the relaxation dispersion auto-analysis in the GUI
Tutorial added Tutorial for R1/R2 Relaxation curve-fitting analysis on varian recorded as fid interleaved
Matplotlib example added Matplotlib example
Tutorial added Relaxation dispersion analysis R1_rho recorded on varian
Tutorial added Relaxation dispersion analysis cpmg fixed time recorded on varian as fid interleaved
Tutorial added Adding relaxation dispersion models to relax
wiki namespace changed The wiki is now placed at: as of 19 of July 2013
GPL License The License has been changed to GPL v3.
New Wiki This is the new wiki
Did you know...

NS CPMG 2-site star full

The relaxation dispersion model for the numeric solution (NS) to the Bloch-McConnell equations for SQ CPMG-type data using complex conjugate matrices. The model is labelled as NS CPMG 2-site star full in relax.


The NS CPMG 2-site star full model has the parameters {R2A0, R2B0, ..., pA, Δω, kex}.


The library code:


The function uses an explicit matrix that contains relaxation, exchange and chemical shift terms. It does the 180 deg pulses in the CPMG train with conjugate complex matrices. The approach of Bloch-McConnell can be found in chapter 3.1 of Palmer, A. G. 2004 Chem. Rev., 104, 3623-3640. This function was written, ..→

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relax starting interface
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R2 analysis
Model-free analysis
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Spin viewer window
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relax prompt window
About GUI screen
About relax screen