relax: dynamics analysis, model-free analysis, relaxation data, R1 and R2 exponential curve-fitting, steady-state NOE calculation, reduced spectral density mapping, relaxation dispersion, N-state model, frame order dynamics theories, stereochemistry, conformational analysis, organic molecules, proteins, RNA, DNA, sugars, and other biomolecules.

relax - Molecular dynamics by NMR data analysis

Analysis software for: Model-free, NMR relaxation (R1, R2, NOE), reduced spectral density mapping, relaxation dispersion, N-state models, frame order theory.


The internal help system

To learn how to use the program relax, there are three major approaches which can be taken. The first is the internal help system within relax. From the command line type 'relax' to start the program, you will then be presented with the prompt:


The help system consists of using tab completion to return a listing of all available functions together with the help function which presents a description of these functions. For instance, to receive help for the function 'minimise', type:

relax> help(minimise)

The information returned should be sufficient for understanding all options of that function.

Sample scripts

The easiest way of starting to use relax is by copying the sample scripts from the directory 'sample_scripts' found within the base directory of the relax installation, and to modify it to suit the protein being studied. Many scripts can be found which implement various aspects of model-free data analysis.

The manual

The best source of information is the current version of the relax user manual which is distributed with relax. It is available as both a high quality PDF and a HTML version which can be browsed online:

You can also search through the HTML versions of the manuals using the Google search tool:

WWW relax manual

The mailing list archives

Another source of information is the relax mailing list archives. The mailing lists are described on the communication page. These archives can also be searched.